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Convection in the upper mantle

Magma injection at the spreading boundaries

Gravity pulling the plates downward at subduction zones

These are three theorized causes of?

User WENDYN
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2 Answers

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I just took this test. it is : movement of the tectonic plates.

:)

User Hien Nguyen
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movement of the tectonic plates.
User Elzaer
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