6. Why does the oceanic crust sink beneath the continental crust at then

subduction zone?

A. The oceanic crust has a greater density.

B. The oceanic crust is pulled downward by Earth’s magnetic field.

C. The oceanic crust is pushed from the ridge.

D. The continental crust has a denser composition.


7. What happens when two oceanic plates collide?

A. The hot spot will form.

B. The volcano island arc will form.

C. The volcanoes on the edge of a continent will form.

D. The volcano along the mid-oceanic ridge will form.


8. What is produced in the convergence of two continental plates?

A. folded mountains C. rift valleys

B. island arcs D. trenches​