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22 Cards in this Set
- Front
- Back
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Continental Drift
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continents moved from Pangaea to where they are today
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Pangaea
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"all lands"
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Panthalassa
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"all seas"
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Mesosaurus
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a small, extinct land reptile that lived 270 million years ago
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Mid-Atlantic Ridge
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an undersea mountain range with a steep, narrow valley running down its center
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mid-ocean ridges
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65,000 km long that wind there way around the earth
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Seafloor Spreading
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the ocean floor was moving away from both sides of the ridge.As the ocean floor moved away from the ridge, it was replaced by rising magma that cooled and solidified into new rock
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Plate Tectonics
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the study features in the earths crust
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Oceanic Crust
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crust under the ocean
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Continental Crust
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crust under the continents
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Lithosphere
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the oceanic and continental crust and the rigid upper mantle
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Asthenosphere
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layer of plastic rock that is solid rock that slowly flows (like putty) when under pressure
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Divergent Boundary
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two plates moving away from eachother
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Rift Valley
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in the center of a mid-ocean ridge is a narrow valley formed as plates seperate
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Convergent Boundary
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the direct collision of one plate with anothermakes another type of plate boundary
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Subducted
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dense crust forced under less dense force
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Subduction Zone
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.the region along the plate boundary where one plate mpoves under another plate
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Ocean Trench
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forms along a subduction zone;
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Transform Fault Boundary
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forms when two plates are grinding past eachother
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Convection Current
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cycle of warm water rising and cool water sinking to replace it
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Theory of Suspect Terranes
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the continents are actually a patchwork of terranes
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Terranes
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pieces of lithosphere, each with its own distinct geologic history
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