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Cards In This Set
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1) Stress?
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1) Forces applied to rock by Earth movement or weight of overlying rocks. Rocks behave in different ways to stress according to their physical properties.
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2) Strain?
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2) The deformation caused by applied forces, can change the volume and shape.
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3) Competent rock?
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3) Stay the same thickness when deformed and react in a brittle way (sandstone). Strong and brittle, tend to joint and fault.
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4) Incompetent rock?
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4) Vary in thickness and when deformed behave in a plastic way (shale). Weak and plastic, tend to fold. Brittle is easily crcked or fractured.
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5) Elastic limit?
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5) Maximum stress that can be applied without causing permenent deformation.
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6) Rupture?
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6) Where the rock snaps and breaks.
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7) Plastic deformation?
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7) Deformation of the rock is irreversible.
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8) Tensional and compressional forces?
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8) Tensional: Fracturing of rocks.
Compressional: Fracturing or folding of rocks.
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9) Temperature of environment?
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9) Cold rocks are more likely to fracture, warm a more likely to fold.
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10) Pressure?
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10) Rocks at depth are more likely to deform before they fracture.
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11) Time?
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11) If for a short time, rocks may fracture, whereas pressure applied for a long time may result with plastic deformation.
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