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Plate Tectonics

6th grade Plate Tectonics

QuestionAnswer
Who was the scientist to come up with the Continental Drift theory? Alfred Wegener
What is Continental Drift theory? An idea that said all the continents used to be together and have drifted apart over the years.
Pangaea The single landmass that broke apart about 250 million years ago to make the continents we have now.
Fossil Any trace of an ancient organism that has been preserved in rock.
What evidence is there to support Pangaea? Fossils of the same animals and plants were found on different continents, way across the ocean.
Sea-floor spreading The way new ocean floor is made.
Mid-ocean ridge An underwater mountain range where molten material will erupt from the mantle.
Parallel magnetic stripes Different types of rock that changes every 10-50 km on either side of the mid-ocean ridge that helps prove sea-floor spreading.
Tectonic Plates The different broken up parts of the lithosphere.
Oceanic crust A type of tectonic plate under ocean.
Continental crust a type of tectonic plate under land.
Convection Currents The process in which magma heats up and rises then cools down and sinks, over and over again.
Subduction The process by which oceanic crust sinks into deep-sea trenches after colliding into other crust..
Lithosphere Uppermost part of the mantle together with the crust.
Created by: user-2065287
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