Which part of earth's interior drives movements of the plates?

Plates at our planet’s surface move because of the intense heat in the Earth’s core that causes molten rock in the mantle layer to move. It moves in a pattern called a convection cell that forms when warm material rises, cools, and eventually sink down. As the cooled material sinks down, it is warmed and rises again.

fh gyu jfh fluffy y gyu gyu gyu gyu fyuf hug uhfyu fungus f jy hug fy iffy ya guy fyuf usf us gyu gyu uyfuy fyu gyu fyu fyuf you fyu fyu uyf fyu fyu jy uyf uyf guys y fyuyg giygy iuf giu fyi iuf ya ffui fui hive guy gyu giu iuf ya giu jyu