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Earth Changes Voc. 1

QuestionAnswer
Lithosphere Layer of earth made up of crust and the rigid part of the upper mantle.
Asthenosphere Layers in earth's upper mantle that is soft because it is close to melting.
Tectonic Plate One of the large moving pieces of Earth's lithosphere. (Oceanic/Continental.)
Continental Drift Hypothesis that Earth's continents move on earth's surface.
Pangaea Hypothetical super continent that included all the land masses of Earth. broke apart 200 million years ago.
Theory of Plate Tectonics Theory stating earth's lithosphere is broken into huge plates that move and change in size over time.
Rift Valley Deep valley formed as tectonic plates move apart, such as along the mid-ocean ridge.
Magnetic Reversal Switch in the direction of the Earth magnetic field so that magnetic north and south switch.
Hot Spot Area where a column of hot material rises from deep within the mantle and heats the lithosphere,causing volcanic activity.
Subduction When oceanic plate sinks under another plate in a earths mantle.
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