Scientists Baffled to Find Signs of Another Core Within Earth’s Inner Core, Say ‘We Have to Rewrite the Textbooks’ For ...

Sinking in one place leads to plates moving apart in other places. The movement of the plates and the activity inside the Earth, is called the theory of plate tectonics.

Alternatively, as shown in the diagram, convection currents under ... The movement of the plates, and the activity inside the Earth, is described as the theory of plate tectonics.