When the crust of the earth is the new cool ocean, it is more than ten times more than one million years, the density will be gradually increased until the sticky layers of rock more than is on the bottom, then it will be buried under the earth in a process called subduction.(convergent plate boundaries) where the crust of the earth is the second movement of the crust of the earth in the Ocean will be heavier than the crash and buried beneath the crust of the earth, the light on the continent than earthquakes and volcano
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