Theory of Plate Tectonics:the lithosphere (outer rigid layer of the Earth) is divided into several dozen plates that move in relation to each other on a fluid layer in the uppermost part of the mantle of the Earth called the asthenosphere.
● Plates move approximately 5 cm per year and
● continually change size and shape
What drives plate movement?
Plate movement
Convection currents within the mantle drive plate movement