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Plate Tectonics

FOSS Inv. 6 Earth History

QuestionAnswer
Theory of Continental Drift Wegner's theory that continents were once connected as one super continent called Pangea.
Lithospheric plates large chunks that afloat on the asthenosphere
Theory of Plate Tectonics The lithosphere is broken into plates that slowly move.
Ring of Fire circle of volcanoes along the Pacific coastlines
oceanic plate thinner, but heavier chunks of lithosphere under the ocean.
continental plate thicker, but lighter chunks of lithosphere under the continents
Alfred Wegener Known for his work with Pangaea and continental drift
magma molten rock beneath the Earth's surface. The mantle is mostly this.
subduction oceanic crust sinks beneath a deep ocean trench and back into the mantle at a convergent plate boundary.
convergent boundary the boundary between tectonic plates that are colliding
divergent boundary A plate boundary where two plates move away from each other.
sea-floor spreading The process by which molten material adds new oceanic crust to the ocean floor
transform boundary plates slide past each other
Created by: BMortimer
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