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.

Chapter 5 Deformation of the Crust

5.1 How is the crust deformed?

Deformation -the bending, tilting, and breaking of the earth’s crust

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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

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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