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Plate Tectonics Review Activities

AB
continental drifttheory that continents move over plates
Pangaeaidea that continents were once a single large land mass
plateshuge slabs of the crust and mantle that are divided
seafloor spreadingthe process of the ocean floor extending out when two plates move apart
convection currentheated water rises to top and then cools sinking to bottom
subductionthe process of plates moving and one goes underneath another
Alfred WegenerGerman scientist who developed the idea of continental drift
Mid Atlantic Ridgemagma that has cooled and formed a ridge that stretches for 50,000 miles
lithospheresolid outer portion of earth which is composed of crust and mantle
asthenospheresoft layer of mantle, below the lithosphere

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