Plate Boundaries

There are three kinds of plate boundaries, divergant, convergant, and transform boundaries.
Divergent boundareis are also known as a spreading center. At this center, two plates move apart from each other. When this process is in progress, the magma bubbles up to the surface and creates mid-ocean ridges. Divergent boundaries are responsible for the current motion of plates and sea floor spreading.

Convergent boundaries are also known as destructive plate boundaries. This is because of subduction, or when one plate sinks under another plate. When subduction occurs, plates collide and cause earthquakes. When plates fold a convergant boundary, mountain ranges form.

A transform boundary is a place where two plates slide by each other. An example of this is the San Andreas fault in California. Earthquakes also occur at these boundaries.