Can someone tell what is the theory of plate tectonics

answer:

plate tectonics is the theory that earth's outer shell is divided into several plates that glide over the mantle, the rocky inner layer above the core.

step-by-step explanation:

plate tectonics is a scientific theory describing the large-scale motion of seven large plates and the movements of a larger number of smaller plates of the earth's lithosphere, since tectonic processes began on earth between 3.3 and 3.5 billion years ago.