Which of the following is a source of heat for magma formation? magma plumes in the continental crust friction due to divergence friction due to subduction magma plumes in the oceanic crust

The answer is; friction due to subduction

In the subduction zone (where tectonic plates collide), when the oceanic plate is being subducted under the continental plate, there is enormous pressure and friction as a result. The pressure causes an increase in temperatures in the region that rise above the melting point of the rocks. The rocks begin to melt and the magma rises and form mountains ranges along the ridge.

54 degrees incident angle = reflected angle

angle is from normal turned to line of ray