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20 Cards in this Set
- Front
- Back
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Type of crust that is thick and composed of granite |
continental crust |
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Type of crust that is thin and composed of basalt |
oceanic crust |
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The topmost solid part of the Earth |
lithosphere |
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The upper part of Earth's mantle |
asthenosphere |
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The layer of Earth that lies between the crust and the core |
mantle |
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The circular movement of a fluid that results when warm matter rises and cooler matter sinks to take its place |
convection current |
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Theory that suggests that the continents were all once joined and then broke apart to move to their present positions |
continental drift |
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Records of the Earth's magnetism preserved in rocks on the ocean floor |
magnetic stripes |
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An underwater mountain chain on the ocean floor |
midocean ridge |
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Process where two pieces of oceanic crust move apart and magma rises upward |
sea floor spreading |
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A deep crack on the ocean floor that forms when once piece of oceanic crust is pushed beneath another |
oceanic trench |
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Process where one tectonic plate pushes another plate downward |
subduction |
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A piece of the lithosphere that moves |
lithospheric plate |
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Theory that suggest that pieces of Earth's crust move relative to one another |
plate tectonics |
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Type of plate boundary that forms where two lithospheric plates come together |
convergent boundary |
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Type of plate boundary that forms where two lithospheric plates move away from each other |
divergent boundary |
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Type of plate boundary where one plate slides horizontally past another |
transform boundary |
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A curved line of islands that forms along a convergent boundary |
island arc |
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Famous fault in California where many earthquakes occur |
San Andreas Fault |
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Area on the ocean floor where magma rises upward to form a volcanic island |
hotspot |
