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11 Vocab. Words

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Question
Answer
Lithosphere   A rigid layer made up of the uppermost part of the mantle and crust.  
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Athenosphere   The soft layer of the mantle on which the lithopshere floats.  
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Convection Current   The movement of a fluid,caused by differences in tempature, that transfers heat from one part of the fluid to another.  
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Conduction   The transfer of heat within a material or between materials that are touching?  
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Convection   The transfer of heat by movement of a fluid.  
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Continental Drift   The hypothesis that the contninents slowly move across Earth's surface.  
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Pangaea   The single landmass that broke apart 200 million years ago and gave rise to today's continents.  
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Fossil   A trace of an ancient organism that has been perserved in rock.  
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Mid-Ocean Ridge   An undersea mountain chain where new ocean floor is produced; a divergent plate boundary.  
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Sea-Floor Spreading   The process by which molten material adds new oceanic crust to the ocean floor.  
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Deep- Ocean Trench.   A deep valley along the ocean floor beneath which oceaninc crust slowly sinks towards the mantle.  
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