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Plate Tectonics

Unit 4

TermDefinition
Crust Thin, outermost part of the Earth that sits on top of the mantle.
Core The central, innermost part of the Earth.
Mantle The layer of rock between the crust and the core.
Lithosphere The crust and the upper part of the mantle; contains tectonic plates
Asthenosphere The soft layer of the mantle on which tectonic plates move.
Mesosphere The lower part of the mantle.
Tectonic Plate Block of lithosphere that moves on the asthenosphere.
Continental Drift Wegener's hypothesis that the continents once formed a single landmass, broke up, and drifted to their present locations.
Sea-floor Spreading The process that creates new ocean crust as magma rises towards the surfaces and solidifies.
Plate Tectonics Theory Explains how Earth's outermost layers move and change shape.
Convergent Boundary Boundary formed by the collision of two plates.
Divergent Boundary Boundary between two plates that are moving apart.
Transform Boundary Boundary between plates that are sliding past each other.
Compression Stress that squeezes
Tension Stress that stretches
Folding Bending of rock layers
Fault Break in the Earth's crust alond which one block slides relative to another
Uplift The rising of the crust to higher elevations.
Created by: jeffsingleton
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