Chapter 15.4 Deforming the Earth’s Crust stress a force that acts on rock deforming it’s shape...
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Transcript of Chapter 15.4 Deforming the Earth’s Crust stress a force that acts on rock deforming it’s shape...
3 typesof stress
shearing tension compression
pushes rock in
opposite directions
pulls on cruststretches rock so that it becomes
thinner in the middle
squeezes rock until it folds
or breaks
YouTube video-Bill Nye Stress
Folding
Folded Mountains
• fold-bend in rock that forms when compression shortens & thickens part of Earth’s crust –can create folded Mountains
3 typesof faults
strike-slip normal reverse
caused by shearing
caused bytension
caused bycompression
Fault-Block Mountains
• mountains formed when normal faults cause large blocks of rocks to slip down due to tension
Grand Teton mountain range
Uplift and Subsidence• Vertical movements in the crust are
divided into two types—– Uplift – the rising of regions of the Earth’s
crust to higher elevations (mountains and rebound – slow movement back to normal level after weight is removed)
– Subsidence – sinking of regions of Earth’s crust to lower elevations (rift zones and oceanic crust as it moves away from the ridge)
• The Colorado Plateau is a 150,000 square mile region covering parts of Arizona, Utah, Colorado, and New Mexico.
fault-block mountain• What is a mountain formed when normal faults cause a block of rock to slip down?
Sierra-Nevada mountain range
tensiontensionWhat type of stress pulls on the
crust, stretching the rock so that it becomes thinner in the middle ?
B. shearingB. shearing
• What type of stress pushes rock in opposite directions?
A. tensionA. tension
What type of fault is caused by shearing?
A.A. Strike-slipStrike-slipB.B. NormalNormalC.C. ReverseReverseD.D. Fault-blockFault-block