Describe the relative plate motion at each of these boundaries.
Sea floor spreading is the process that occurs at divergent plate boundaries.
The two plates pull apart, and asthenosphere rises to fill the gap. Because pressure decreases as the asthenosphere rises, the asthenosphere partially melts, producing mafic magma. Briefly describe how the Himalaya Mountains formed. Continental crust of India is colliding with the continental crust of Asia along a continent-continent convergent plate boundary. Some predict that California will sink into the ocean.