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The current accepted theory is that the ocean pates are subducted (dive) down toward the earth's interior at the ocean trenches. A major problem with this is that there are not nearly enough trenches to take all the ocean plates. So it has been proposed that the trenches are actually a very deep, wide crack in the ocean floor filled with water and sediment and that molten rock from far below flows toward this now lighter region but forces up mountains over a batholith (a huge mass of molten magma) before it reaches the trench. For further discussion of this see http://charles_w.tripod.com/trenches.html

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17y ago

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