asked 12.3k views
4 votes
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?

asked
User WENDYN
by
7.7k points

2 Answers

5 votes

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

:)

answered
User Hien Nguyen
by
8.9k points
2 votes
movement of the tectonic plates.
answered
User Elzaer
by
7.9k points
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