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Deformation
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The bending, tilting, and breaking of Earth's crust; the change in shape or volume of rock in response to stress.
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Asthenosphere
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Plastic part of mantle, below lithosphere.
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Isostasy
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A condition o gravitational and buoyant equilibrium between Earth's lithosphere and asthenosphere.
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Isostatic adjustment
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The movements of the lithosphere to reach isostasy
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Uplift
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Process by which an area may rise by isostatic adjustment
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Subsidence
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Process that occurs when added weight of the deposited material causes the ocean floor to sink by isostatic adjustment.
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Stress
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Amount of force per unit area that acts on a rock
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Compression
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Type of stress that squeezes or shortens a body
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Tension
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Stress that stretches and pulls a body apart.
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Shear stress
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Stress that distorts a body by pushing parts of the boy in opposite directions.
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Strain
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Any change in a rock's shape or volume caused by stress
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Brittle
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Materials that respond to stress by breaking or fracturing
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Ductile
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Materials that respond to stress by bending or deforming without breaking.
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Fold
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A form of ductile strain in which rock layers bend, usually as a result of compression.
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Limbs
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Sloping sides of a fold
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