Question

Why do plates move?a short notes on this.

Answer 1

The plates move because of the movement of molten magma inside the earth.The Molten magma moves in a circular manner.This resulted in 
earthquakes.

Answer 2

the plates fully known as lithosphereick plates or continental plates move because of the molten magma present inside the earth .this caused many changes on the surface of the earth [first when the the earth was formed there was one continent made from all the continents that are now this continment was know as super continent ] the movement of magma is slow most of the times but some times it is not and can cause earthquakes and volcanoes