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Mr. Biando's Lab

Mr. Biando's Lab Plate Tectonics

TermDefinition
Alfred Wegener Scientist who hypothesized the theory of continental drift.
Continental Drift The hypothesis that states that the continents once formed a single landmass, broke up, and drifted to their present locations.
Pangaea A name given to a large single landmass made up of all the continents. Greek for "all earth"
Laurasia The northern piece of the two land masses that formed after Pangaea broke apart.
Gondwana The southern piece of the two land masses that formed after Pangaea broke apart.
Sea-Floor Spreading The process by which new oceanic lithosphere forms as the magma rises towards the surface and solidifies.
Mid-ocean ridges Underwater mountain chains that run through the Earth's ocean basins where sea-floor spreading takes place.
Magnetic Reversal When the Earth's magnetic poles change polarity.
Lithosphere The solid, outer layer of the Earth that is made up of the crust and the upper mantle
Crust The thin and solid outermost layer of the Earth above the mantle
Mantle The layer of rock between the Earth's crust and core. Makes up 67% of Eath's mass.
Core the central part of the Earth below the mantle
Asthenosphere The soft layer of the mntle on which the tectonic plates move.
Mesosphere The strong, lower part of the mantle between the asthenosphere and the outer core
Tectonic Plate A block of lithosphere that contains crust and the outermost part of the mantle
Plate Tectonics The theory that explains how large pieces of the Earth's outer layer move and change shape
Convergent Boundary The boundary formed by the collision of two plates
Divergent Boundary The boundary between two plates that are moving away from each other
Transform Boundary The boundary between plates that are sliding past each other horizontally
Created by: dbiando
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