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14 Cards in this Set
- Front
- Back
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mantle
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the layer of the Earht between the core and the crust
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magnetometer
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device used by scientists to show how particles of iron line up within rock
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sonar
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a device used to map the ocean floor by sending out a sound and then receiving the echo of that sound
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magnetic field
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area around a magnet where the effects of magnetism are felt
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magnetic reversal
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a flip of the Earth's magnetic field
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Pangaea
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giant landmass that existed about 200 million years ago
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fossil remains
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the proof that Alfred Wegener found on separate continents to prove his theory.
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theory of continental drift
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Alfred Wegener's theory stated the continents were once one landmass that broke apart
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mid-ocean ridge
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a very large crack in the ocean floor
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puzzlelike fit of continental shelves
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the evidence that the continents were once together
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theory of plate tectonics
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idea that Earth's crust and upper mantle are broken into enormous slabs
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plate boundaries
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where earthquakes and volcanoes occur
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sea-floor spreading
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the process by which new ocean floor is continually being added
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tectonic plates
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made up of Earth's crust and upper mantle
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