plate tectonics:
definition:is the theory which explains how large pieces of the lithosphere,called plates which move and change shape.
definition:is the theory which explains how large pieces of the lithosphere,called plates which move and change shape.
continental drift
definition:is the hypothesis which states that the continents once formed a single landmass and broke up,and drifted to their present location.
definition:is the hypothesis which states that the continents once formed a single landmass and broke up,and drifted to their present location.
mid-ocean ridge
definition:which is a long,undersea mountain chain that has a steep,narrow valley.
definition:which is a long,undersea mountain chain that has a steep,narrow valley.
pangaea
definition:is supercontinent which is formed 300 million years ago and which began to break up 250 million years ago.
definition:is supercontinent which is formed 300 million years ago and which began to break up 250 million years ago.
lithosphere
definition:is the solid,outer layer of earth which consists of the crust and the rigid upper part of the mantle.
definition:is the solid,outer layer of earth which consists of the crust and the rigid upper part of the mantle.
asthenosphere
definition:which is the solid,plastic layer of the mantle that is beneath the lithosphere;made of mantle rock that flows very slowly,which allows the tectonic plates to move on top of it.
definition:which is the solid,plastic layer of the mantle that is beneath the lithosphere;made of mantle rock that flows very slowly,which allows the tectonic plates to move on top of it.
rift valleys
definition:is a long steep valley formed when two parallel rifts form in earths crust and the land between them sinks.
definition:is a long steep valley formed when two parallel rifts form in earths crust and the land between them sinks.