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Chapter 5 Deformation of the Crust
5.1 How is the crust deformed?
Deformation -the bending, tilting, and breaking of the earth’s crust
Turn to text page 83
Isostatic adjustment
Isostasy – the balance between the forces of the crust pressing down on the mantle, and the mantle pressing up on the crust
Isostatic adjustments cause the crust to bend up and down
Why do isostatic adjustments constantly occur in areas with mountain ranges?
Mountain ranges erode. As the crust lightens, area rises Rivers can carry large amounts of mud, sand, and gravel.
Glaciers melt, so crust rises
StressStress – force that causes pressure in the rocks of the crust
Compression Rocks are squeezed together
Tension Force that pulls rocks apart
Shearing Push rocks in opposite directions
Turn to text page 84
Identify the stress forces on the rocks below...
Identify the stress forces on the rocks below...
Shearing
Identify the stress forces on the rocks below...
Shearing
Tension
Identify the stress forces on the rocks below...
Tension
Shearing
Tension
Identify the stress forces on the rocks below...
CompressionTension
Shearing
Tension