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Earth Changes Voc. 1
Question | Answer |
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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. |