![]() ![]() ![]() Continental crust, on the other hand, is less dense and “floats” on the mantle. As plates slip beneath others into the mantle of hot rock below, new crust is formed at oceanic ridges – volcanic strips that spew vast amounts of magma onto the surface of the crust.īut this means that most oceanic crust today is less than 200 million years old. His work was published in Nature Geoscience.Įarth’s crust is a constantly recycling and evolving. Roi Granot at the Ben-Gurion University of the Negev, Beersheba analysed patterns of Earth’s magnetic field locked in submerged rocks and, working backwards, calculated a patch to have formed when the supercontinent Pangaea broke apart during the Palaeozoic era. The world’s oldest oceanic crust – around 340 million years old – lies at the bottom of the eastern Mediterranean Sea, according to a geologist in Israel. ![]()
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