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6th Grade

Science - Tectonic Plates

TermDefinition
tectonic plate a block of lithosphere that consists of the crust and the rigid, outermost part of the mantle
continental drift the hypothesis that the continents once formed a single land mass, broke up, and drifted to their present locations
Pangaea the landmass that existed when all continents were joined
Sea-floor spreading process of new ocenaic crust forming as magma rises toward the surface and solidifies
mid-ocean ridge place where sea-floor spreading takes place
Theory of Plate Tectonics theory that explains how large pieces of Earth's outermost layer, the tectonic plates, moves and change shape
convergent boundary boundary formed by the collision of two tectonic plates
divergent boundary boundary between two tectonic plates that are moving away from each other
transform boundary boundary between two tectonic plates that are scraping past each other horizontally
Ring of Fire a ring of fire around the Pacific Plate
Created by: stanlep
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