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With a density greater than that of the continental crust, the oceanic crust is the part of the earth's crust that forms the oceans. Its antiquity does not reach 200 years, and it lacks granite layer.
Not all ocean waters are part of the oceanic crust, since there is a surface area that belongs to the continental crust. In total, the oceanic crust occupies 0.099% of the Earth's mass.
In the oceanic crust, four zones are distinguished: ocean ridges, abyssal plains, guyots and abyssal pits.
The ocean ridges are large elevations, up to 3,000 meters high, which are located on the ocean floor. Located at the edges of lithospheric plates, they are usually associated with underwater volcanoes.
The abyssal plains are large very flat extensions on which the submarine mountains or guyots usually rise. The guyots usually have their flat top, since it was eroded when it was at sea level.
Finally, the abyssal pits are those deep and narrow gaps where sediments accumulate. S found at the edges of the plate, very close to a continent or an insular zone. They are usually associated with the presence of earthquakes.
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