Plate tectonics with vocabulary
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Transcript of Plate tectonics with vocabulary
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VOCABULARY
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plate tectonics-
theory that continents are in slow, constant motion.
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continents-
huge land masses
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Continental Drift-
the theory that the continents were once a single land mass and have broken apart and “floated” to where they are today
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Alfred Wegener-
German geologist who first came up with the Continental Drift theory in 1915
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Pangaea-
name that Wegener gave to the land mass known as the Supercontinent
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Mid-ocean ridge-
the longest mountain chain in the world
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Sea-floor spreading-
At the mid-ocean ridge, molten material rises from the mantle, then spreads out, pushing older rock to both sides of the ridge. This process, called sea-floor spreading, forms the new ocean floor.
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magma-
molten mixture of rock-forming substances, gases, and water that make up the earth’s mantle
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lava-
magma that has reached the surface; also the rock that’s formed when the liquid lava hardens
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volcano
a weak spot in the crust where magma has come to the surface
Video http://www.cbsnews.com/video/watch/?id=7389841n&tag=mncol;lst;10
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fault-
a break in rock where the rocks slide past each other; a break in the earth’s crust; earthquakes occur along faults
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earthquake-
the shaking that results from the movement of rock beneath the earth’s surface
http://video.nationalgeographic.com/video/player/environment/environment-natural-disasters/earthquakes/earthquake-101.html
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uplift-
the raising of the earth’s crust; usually results in mountain formation
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intrusion-
molten rock that has squeezed into existing rock and hardened
Intrusion of mafic rock into granite
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subduction-
process by which the ocean floor sinks back into the mantle
http://oregonstate.edu/media/trcnb-hiq
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rift valley-
a deep valley that forms where two plates move apart