Plate tectonics- the theory that explains how large pieces of the lithosphere, called plates, move and change shape.
continental drift- the hypothesis that states that the continents once formed a single landmass, broke up, and drifted to their present locations.
pangaea- the supercontinent that formed 300 million years ago and that began to break up 250 million years ago.
Asthenosphere- the solid, plastic layer of the mantle beneath the lithosphere; made of mantle rock that flows very slowly, which allows tectonic plates to move on top of it.
Lithosphere- the solid, outer layer of earth that consits of the crust and the rigid upper prt of the mantle.