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18 Cards in this Set
- Front
- Back
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plate tectonics
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describes continental movement; proposes a possible explanation of why and how continents move
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2 types of earth's crust
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oceanic crust
continental crust |
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Oceanic Crust
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material on ocean floor
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continental crust
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continental landmasses
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lithosphere
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oceanic continental crust and rigid upper mantle
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asthenosphere
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layer of plastic, solid rock; flows like putty when under pressure
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tectonics
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"construction" ;Greek word
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divergent boundary
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2 plates moving apart from one another
<-------- -------> |
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rift valley
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in center of mid-ocean ridge; narrow valley as plates seperate
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convergent boundary
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plates push neighboring plates at other boundaries
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subduction zone
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region along plate boundary where one plates under another plate
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subducted
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forced under the less dense continental crust
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ocean trench
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forms along subducted zone; as plate move down into a subduction zone, it melts and becomes part of mantle
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island arc
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result of molton rock rises to the surface along the trench to form a chain of volcanic islands
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transform boundary
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2 plates grinding past each other
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convection current
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cycle of warm water rising and cool water sinking to replace
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theory of suspect terranes
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theory suggests that the continents are actually a patchwork of terranes
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terranes
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pieces of the lithosphere, each with its own distinct geologic history
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