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16 Cards in this Set
- Front
- Back
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continental drift
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Wegener's hypothesis that all continents were once connected in a single, large landmass
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Pangaea
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large, ancient landmass that was composed of all the continents joined together
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sea floor spreading
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Hess's theory that new seafloor is formed when magma is forced upward toward the surface at a mid-ocean ridge
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plate tectonics
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theory that Earth's crust and upper mantle are broken into plates that float and move around
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plate
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a large section of Earth's oceanic or continental crust and rigid upper mantle that moves around on the asthenosphere
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lithosphere
litho-earth sphere-round |
rigid layer of Earth about 100 km thick, made of the crust and a part of the upper mantle
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asthenosphere
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plasticlike layer of Earth on which the lithospheric plates float and move around
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convection current
convection deals with heat |
current in Earth's mantle that transfers heat in Earth's interior and is the driving force for plate tectonics
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Alfred Wegener
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Pangaea
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Wegener's idea
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of continental drift
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mapping of the ocean floor in the 1950s showed
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underwater mountains and rift valleys
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Harry Hess
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suggested seafloor spreading
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How is magnetic evidence preserved in rocks forming along a mid-ocean ridge
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do you know this?
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magnetic evidence
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theory of seafloor spreading is supported by magnetic evidence in rocks
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convection currents
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move plates
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How do converging plates form mountains?
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converge means come together, they overlap and form mountains
diverge means split apart (trench) |
