plate tectonics:is the theory that earths outer shell is divided into several plates that glide over the mantle.
continental drift:is a movimient of the earths continents.
pangea:the super continent that existed 250 million years ago.
Asthenosphere:is the highly viscous mechanically weak and ductilely deforming region of the upper mantle of the earth.
lithosphere : is the rigid outersmost shell of a rocky planet.
mid ocean ridge: is general term for underwater mountain.
subduction: is the process that takes place at convergent boundaries by whone tectonic plate.