{"id":7346,"date":"2022-08-12T00:00:00","date_gmt":"2022-08-12T00:00:00","guid":{"rendered":"https:\/\/www.nextias.com\/current_affairs\/uncategorized\/12-08-2022\/formation-of-continents\/"},"modified":"2022-08-12T00:00:00","modified_gmt":"2022-08-12T00:00:00","slug":"formation-of-continents","status":"publish","type":"post","link":"https:\/\/www.nextias.com\/ca\/current-affairs\/12-08-2022\/formation-of-continents","title":{"rendered":"Formation of Continents"},"content":{"rendered":"<p><span style=\"font-size:13pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong><u>In Context<\/u><\/strong><\/span><\/span><\/span><\/span><\/p>\n<ul>\n<li style=\"list-style-type:disc\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">According to a recent study published in Nature journal, giant meteorite impacts could be responsible for the formation of continents on Earth.<\/span><\/span><\/span><\/span><\/li>\n<\/ul>\n<p><span style=\"font-size:13pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong><u>More about the study<\/u><\/strong><\/span><\/span><\/span><\/span><\/p>\n<ul>\n<li style=\"list-style-type:disc\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong>About:<\/strong><\/span><\/span><\/span><\/span>\n<ul>\n<li style=\"list-style-type:circle\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">According to the study,<\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong> Earth\u2019s continents<\/strong><\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"> were formed by<\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong> massive meteorite impacts<\/strong><\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"> that were prevalent during the <\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong>first billion years of our planet\u2019s four and a half billion-year history<\/strong><\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">.<\/span><\/span><\/span><\/span><\/li>\n<li style=\"list-style-type:circle\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">Meteorite impacts <\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong>generated massive energy<\/strong><\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"> to form<\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong> oceanic plates<\/strong><\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">, which later evolved into continents.<\/span><\/span><\/span><\/span><\/li>\n<\/ul>\n<\/li>\n<li style=\"list-style-type:disc\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong>The process:<\/strong><\/span><\/span><\/span><\/span>\n<ul>\n<li style=\"list-style-type:circle\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">The giant meteorite hit Earth and melted the outer shell of the Earth or the lithosphere, according to the study.<\/span><\/span><\/span><\/span><\/li>\n<li style=\"list-style-type:circle\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">This impact released the pressure on the underlying mantle.\u00a0<\/span><\/span><\/span><\/span><\/li>\n<li style=\"list-style-type:circle\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">As a result, the mantle likely melted, creating an oceanic plateau.<\/span><\/span><\/span><\/span><\/li>\n<\/ul>\n<\/li>\n<li style=\"list-style-type:disc\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong>Significance:<\/strong><\/span><\/span><\/span><\/span>\n<ul>\n<li style=\"list-style-type:circle\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">Earth is the<\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong> only planet that is known to have continents<\/strong><\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">.\u00a0<\/span><\/span><\/span><\/span><\/li>\n<li style=\"list-style-type:circle\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">What amazes scientists is the evolution and formation of the continents, making it the most researched field amongst planetary scientists.\u00a0<\/span><\/span><\/span><\/span><\/li>\n<li style=\"list-style-type:circle\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong>First of its kind:<\/strong><\/span><\/span><\/span><\/span>\n<ul>\n<li style=\"list-style-type:square\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">It is well known that numerous such impacts have hit the planet <\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong>from archaic times<\/strong><\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">.<\/span><\/span><\/span><\/span><\/li>\n<li style=\"list-style-type:square\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">This research provides the<\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong> first solid evidence<\/strong><\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"> that the processes that ultimately formed the continents began with <\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong>giant meteorite impacts, similar to those responsible for the extinction of the dinosaurs,<\/strong><\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"> but which occurred billions of years earlier.<\/span><\/span><\/span><\/span><\/li>\n<\/ul>\n<\/li>\n<li style=\"list-style-type:circle\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong>Key to reserves of metals:\u00a0<\/strong><\/span><\/span><\/span><\/span>\n<ul>\n<li style=\"list-style-type:square\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">Understanding the formation and evolution of continents is important as it is the key to reserves of metals such as<\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong> lithium, tin and nickel<\/strong><\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">, which are required to develop batteries, the study noted.<\/span><\/span><\/span><\/span>\n<ul>\n<li style=\"list-style-type:disc\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">Shallow melting of the rocks separates the lower density elements, such as lithium, from the higher density ones, such as iron.<\/span><\/span><\/span><\/span><\/li>\n<li style=\"list-style-type:disc\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">Eventually, the lower density elements rise to the surface as a granitic continental crust.\u00a0<\/span><\/span><\/span><\/span><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<li style=\"list-style-type:disc\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong>Meteorites impact other planets too, so why is such a phenomenon exclusive to Earth?<\/strong><\/span><\/span><\/span><\/span>\n<ul>\n<li style=\"list-style-type:circle\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">Other rocky planets and the moon had little or no water by the time the flux of effects declined.<\/span><\/span><\/span><\/span><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<div>\n<table cellspacing=\"0\" style=\"border-collapse:collapse; border:none; width:629px\">\n<tbody>\n<tr>\n<td style=\"border-bottom:1px solid #000000; border-left:1px solid #000000; border-right:1px solid #000000; border-top:1px solid #000000; vertical-align:top; width:629px\">\n<p><span style=\"font-size:13pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong><u>About Impact event<\/u><\/strong><\/span><\/span><\/span><\/span><\/p>\n<ul>\n<li style=\"list-style-type:disc\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong>An impact event<\/strong><\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"> is a collision between<\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong> astronomical objects<\/strong><\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"> causing measurable effects.\u00a0<\/span><\/span><\/span><\/span><\/li>\n<li style=\"list-style-type:disc\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">Impact events have <\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong>physical consequences<\/strong><\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"> and have been found to regularly occur in planetary systems, though the<\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong> most frequent<\/strong><\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"> involve <\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong>asteroids, comets or meteoroids <\/strong><\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">and have <\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong>minimal effect<\/strong><\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">.\u00a0<\/span><\/span><\/span><\/span><\/li>\n<li style=\"list-style-type:disc\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">When <\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong>large objects<\/strong><\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"> impact terrestrial planets such as the Earth, there can be <\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong>significant physical and biospheric consequences<\/strong><\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">, though atmospheres mitigate many surface impacts through atmospheric entry.<\/span><\/span><\/span><\/span><\/li>\n<li style=\"list-style-type:disc\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong>Major impact events<\/strong><\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"> have<\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong> significantly shaped Earth&#8217;s history<\/strong><\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">, having been implicated in the:\u00a0<\/span><\/span><\/span><\/span>\n<ul>\n<li style=\"list-style-type:circle\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">Formation of the Earth\u2013Moon system,\u00a0<\/span><\/span><\/span><\/span><\/li>\n<li style=\"list-style-type:circle\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">The evolutionary history of life,\u00a0<\/span><\/span><\/span><\/span><\/li>\n<li style=\"list-style-type:circle\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">The origin of water on Earth, and\u00a0<\/span><\/span><\/span><\/span><\/li>\n<li style=\"list-style-type:circle\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">Several mass extinctions.<\/span><\/span><\/span><\/span><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p><span style=\"font-size:13pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong><u>Alternative theories of Continent formation<\/u><\/strong><\/span><\/span><\/span><\/span><\/p>\n<ul>\n<li style=\"list-style-type:disc\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">The most commonly accepted theory in place attributes<\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong> continent formation<\/strong><\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"> to the <\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong>movement of tectonic plates<\/strong><\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">.<\/span><\/span><\/span><\/span><\/li>\n<li style=\"list-style-type:disc\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">Earth is uncommon among the planets and also from our moon that its <\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong>outer surface is divided into rigid slabs<\/strong><\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">, which were called <\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong>tectonic plates<\/strong><\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"> by Wegener in his theory.\u00a0<\/span><\/span><\/span><\/span>\n<ul>\n<li style=\"list-style-type:circle\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">While their surfaces exhibit <\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong>evidence of recent deformation<\/strong><\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">, neither planet has a surface divided into plates.<\/span><\/span><\/span><\/span><\/li>\n<\/ul>\n<\/li>\n<li style=\"list-style-type:disc\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">As the technology advanced, making it possible for<\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong> deeper exploration, <\/strong><\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">the <\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong>theories of continental drift and seafloor spreading<\/strong><\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"> got positive scientific data in support.<\/span><\/span><\/span><\/span>\n<ul>\n<li style=\"list-style-type:circle\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">The two theories were merged to develop the modern plate tectonic theory.<\/span><\/span><\/span><\/span><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>\u00a0<\/p>\n<div>\n<table cellspacing=\"0\" style=\"border-collapse:collapse; border:none; width:667px\">\n<tbody>\n<tr>\n<td style=\"border-bottom:1px solid #000000; border-left:1px solid #000000; border-right:1px solid #000000; border-top:1px solid #000000; vertical-align:top; width:667px\">\n<p><span style=\"font-size:13pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong><u>Plate Tectonic Theory\/Plate Tectonic<\/u><\/strong><\/span><\/span><\/span><\/span><\/p>\n<ul>\n<li style=\"list-style-type:disc\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">This concept was formulated in the <\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong>1960s<\/strong><\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"> by <\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong>Alfred Wegener.\u00a0<\/strong><\/span><\/span><\/span><\/span><\/li>\n<li style=\"list-style-type:disc\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">According to the theory, Earth has a rigid outer layer, known as the<\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong> lithosphere<\/strong><\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">, which is typically about 100 km (60 miles) thick and overlies a plastic (moldable, partially molten) layer called the <\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong>asthenosphere<\/strong><\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">.\u00a0<\/span><\/span><\/span><\/span><\/li>\n<li style=\"list-style-type:disc\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">The <\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong>lithosphere is broken up<\/strong><\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"> into:<\/span><\/span><\/span><\/span>\n<ul>\n<li style=\"list-style-type:circle\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong>seven very large<\/strong><\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"> <\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong>continental- and ocean-sized plates,<\/strong><\/span><\/span><\/span><\/span><\/li>\n<li style=\"list-style-type:circle\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong>six or seven medium-sized regional plates<\/strong><\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">, and\u00a0<\/span><\/span><\/span><\/span><\/li>\n<li style=\"list-style-type:circle\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong>several small plates<\/strong><\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">.\u00a0<\/span><\/span><\/span><\/span><\/li>\n<\/ul>\n<\/li>\n<li style=\"list-style-type:disc\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">These <\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong>plates move relative to each other<\/strong><\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">.<\/span><\/span><\/span><\/span>\n<ul>\n<li style=\"list-style-type:circle\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">They typically move at rates of 5 to 10 cm (2 to 4 inches) per year, and interact along their boundaries.<\/span><\/span><\/span><\/span><\/li>\n<li style=\"list-style-type:circle\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">They <\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong>converge, diverge, <\/strong><\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">or <\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong>slip past<\/strong><\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"> one another.\u00a0<\/span><\/span><\/span><\/span><\/li>\n<li style=\"list-style-type:circle\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong>Mountain formation:<\/strong><\/span><\/span><\/span><\/span>\n<ul>\n<li style=\"list-style-type:square\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">Plate motions cause mountains to rise where plates push together or converge.\u00a0<\/span><\/span><\/span><\/span><\/li>\n<\/ul>\n<\/li>\n<li style=\"list-style-type:circle\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong>Ocean formation:<\/strong><\/span><\/span><\/span><\/span>\n<ul>\n<li style=\"list-style-type:square\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">Continents fracture and oceans are formed where plates pull apart or diverge.<\/span><\/span><\/span><\/span><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<li style=\"list-style-type:disc\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">The continents are embedded in the plates and drift passively with them, which over millions of years results in significant changes in Earth\u2019s geography.<\/span><\/span><\/span><\/span><\/li>\n<li style=\"list-style-type:disc\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">Such interactions are thought to be <\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong>responsible for most of Earth\u2019s seismic and volcanic activity<\/strong><\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">, although earthquakes and volcanoes can occur in plate interiors.<\/span><\/span><\/span><\/span><\/li>\n<li style=\"list-style-type:disc\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong>Evidence of Plate Tectonic Theory:<\/strong><\/span><\/span><\/span><\/span><\/li>\n<\/ul>\n<ul>\n<li style=\"list-style-type:disc\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong>Continent Puzzle:<\/strong><\/span><\/span><\/span><\/span>\n<ul>\n<li style=\"list-style-type:circle\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">The<\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong> continents fit together almost like puzzle pieces<\/strong><\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"> forming Pangaea (one super-continent).<\/span><\/span><\/span><\/span><\/li>\n<\/ul>\n<\/li>\n<li style=\"list-style-type:disc\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong>Fossil evidence:<\/strong><\/span><\/span><\/span><\/span>\n<ul>\n<li style=\"list-style-type:circle\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">Fossils on different continents are similar to fossils on continents that were once connected.\u00a0\u00a0<\/span><\/span><\/span><\/span><\/li>\n<li style=\"list-style-type:circle\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">When the continents split, different life forms developed.<\/span><\/span><\/span><\/span><\/li>\n<\/ul>\n<\/li>\n<li style=\"list-style-type:disc\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong>Distributions of rocks:<\/strong><\/span><\/span><\/span><\/span>\n<ul>\n<li style=\"list-style-type:circle\"><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">Most distributions of rocks within Earth&#8217;s crust, including <\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><strong>minerals, fossil fuels, and energy resources<\/strong><\/span><\/span><\/span><\/span><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\">, are a direct result of the history of plate motions and collisions and the corresponding changes in the configurations of the continents and ocean basins.<\/span><\/span><\/span><\/span><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p style=\"text-align:center\"><span style=\"font-size:13pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><span style=\"background-color:#ffffff\"><img decoding=\"async\" src=\"https:\/\/lh5.googleusercontent.com\/n6BSz_w-0PuFVYQx3D0Oq-naa6wPqnSl8Fwq80P9RpCV_KCJBQrLrX_sBAN7xF-N4r5CCXVRBq5JqXw-AOclnFsCP9sN_ujpr7QOMp1K4S3EdYtkjxkMFuHZ8UD8zMxad039N_lQaMrGNAJeHcEG6zI\" style=\"height:345px; width:624px\" \/><\/span><\/span><\/span><\/span><\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>\u00a0<\/p>\n<p><span style=\"font-size:12pt\"><span style=\"font-family:'Book Antiqua',serif\"><span style=\"color:#000000\"><strong>Source: DTE<\/strong><\/span><\/span><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>In Context According to a recent study published in Nature journal, giant meteorite impacts could be responsible for the formation of continents on Earth. More about the study About: According to the study, Earth\u2019s continents were formed by massive meteorite impacts that were prevalent during the first billion years of our planet\u2019s four and a [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":7347,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[21],"tags":[25,45],"class_list":["post-7346","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-current-affairs","tag-gs1","tag-important-geophysical-phenomena"],"acf":[],"jetpack_featured_media_url":"https:\/\/wp-images.nextias.com\/cdn-cgi\/image\/format=auto\/ca\/uploads\/2023\/07\/4670549Screenshot_6.png","_links":{"self":[{"href":"https:\/\/www.nextias.com\/ca\/wp-json\/wp\/v2\/posts\/7346","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.nextias.com\/ca\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.nextias.com\/ca\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.nextias.com\/ca\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.nextias.com\/ca\/wp-json\/wp\/v2\/comments?post=7346"}],"version-history":[{"count":0,"href":"https:\/\/www.nextias.com\/ca\/wp-json\/wp\/v2\/posts\/7346\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.nextias.com\/ca\/wp-json\/wp\/v2\/media\/7347"}],"wp:attachment":[{"href":"https:\/\/www.nextias.com\/ca\/wp-json\/wp\/v2\/media?parent=7346"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.nextias.com\/ca\/wp-json\/wp\/v2\/categories?post=7346"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.nextias.com\/ca\/wp-json\/wp\/v2\/tags?post=7346"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}