Answer the following in one or two sentences:

Define Plate tectonics.

The lithosphere is divided into number of huge slabs known as tectonic plates or lithosphere plates. This plate takes the movement independently over the mantle. The plates are classified into minor plates and major plates. When these plates float, they converge with other plates and therefore mountains and irregular surfaces are being created. This phenomenon takes place both in the continental floor and oceanic floor. This phenomena of movement of plate is known as ‘plate tectonics'.