Chapter 9.2 Plate Tectonics

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