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16 Cards in this Set
- Front
- Back
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Crust |
solid, thin outer layer of Earth |
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Mantle |
Thick layer of Earth below the crust. |
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Core |
innermost region of Earth |
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Continental drift |
theory that the continents were at one or more times a single landmass that broke apart and eventually moved into the positions they are in today |
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Pangaea |
single, giant landmass, or continent, that later broke apart |
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mid-ocean ridge |
Ocean-floor feature resembling a mountain ridge on land. |
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Rift valley |
flat area between two ridges that is formed by spreading plates |
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Seafloor spreading |
process that forms new seafloor |
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Trench |
deep canyon |
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Subduction Zone |
Place where old oceanic crust is forced back down into an ocean trench. |
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Tectonic plates |
large, solid piece of Earth's surface |
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Theory of Plate Tectonics |
theory that Earth's crust is broken in plates that float on the upper part of the mantle |
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Convection current |
movement of a gas or a liquid caused by changes in temperature |
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Plate boundary |
place where two plates meet |
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Magma chamber |
underground pocket of molten rock |
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hot spot |
Place where magma reaches the surface of a tectonic plate. |
