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15 Cards in this Set

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Strain
change in size or shape, or both, while an object is undergoing stress
stress
force or pressure that causes rock movement
compression
squeezed from opposite directions
compression
reduces volume of rock and occurs along convergent plate boundaries
tensional stress
caused by forces pulling away from one anohter in opposite directions
shear stress
movement parallel to but in opposite directions along a fault or other boundary
rock behavior
depends on amount of stress, rate of stress apllied, type of rock and temp., and pressure under which the rock is strained
elastic
when the soalid substance undergoes a change in shape or volumer under stress and will return to its original condition when the stress is removed
plastic
rock will bend under stress and does not return to its original shape after stress is released
brittle
will break or fracture at stresses higher than its elastic limit
faults and joints
forms from brittle rocks
folding or faulting
response of rocks to stress
folds
bends or wave-like features in layered rock, strained plastically
anticlines
upfolded, or arched, rock layers (oldest rock at core)
syncline
downward arching counter part of an anticline trough like fold (youngest rock at core)