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12 Cards in this Set
- Front
- Back
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plates
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earths crust and upper mantle are broken in to enourmous slabs
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crust
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earths most outer layer
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mantle
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layer in the earth between the crust and the core
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earthquake
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when to plates of earth slide in oppiste derections
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sea-floor spreading
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process when a new ocean floor is continually being added
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magnetic field
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area around a magnet where the effects are felt
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magnetic reversal
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when magnetic field flips or reverses from time to time
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plate boundries
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places where plates interact
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theory of plate tectonics
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the teory that earth's lithoshere is broken into enormous slabs or plates that are in motion
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tectonic plates
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{look at def. of plates}
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theory of contenentil drift
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a theory that states that continents formed a single land mass at one time in the past and have drifted over time to thier present postions
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pangaea
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all land
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