Question

why do tectonic plates move? what force or pressure cause this movement? which layers of the earth plays role in the process? short sentence

Answer 1

Tectonic plates move because they ride on slow convective flow in the ductile upper mantle (asthenosphere), driven mainly by slab-pull of cold, sinking lithosphere and aided by ridge-push and mantle drag— the rigid lithosphere forms the plates while the asthenosphere and deeper mantle convection supply the forces.