Question

easy definitions of tectonic plates

Answer 1

The lithosphere of the earth is divided into small number of plates which float on and travel independently over the mantle and much of the earth's seismic activity occurs at the boundaries of these plates

Answer 2

A tectonic plate (also called lithospheric plate) is a massive, irregularly shaped slab of solid rock, generally composed of both continental and oceanic lithosphere. ... By contrast, oceanic crust is composed of basaltic rocks, which are much denser and heavier.