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 locations.
Definition:is the hypothesis which states that the continents once formed a single landmass and broke up,and drifted to their present locations.
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.
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.
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.
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.