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Crustal assimilation happens where some tectonic plates border on each other. These generally occur at deep ocean trenches where the oceanic crust (suducting oceanic lithosphere) is being pushed under the continental crust (continental lithosphere). Water and other volatiles are driven from suducting oceanic crust causing the mantle rock to melt and the resulting magma to rise and form a continental volcanic arc. The "ring of fire" around the Pacific Ocean is a good example of this. When the suducting oceanic lithosphere melts and rises it assimilates with other rocks causing granitic type igneous bodies to form.

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Q: Where does crustal assimilation occur?
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How have crustal plates moved over time?

Molten magma from the mantle rises at the top oceanic ridge, cools and solidifies, continually forming a crustal plate. Hundreds to thousands of miles from the ridge the plate moves downward into the mantle at the contact with another plate and melts. The continuous process resembling a large "conveyor belt" moves the crustal plate a few centimeters each year.


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