Chapter 7 section 4
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Deforming the earth’s crust PowerPoint PPT Presentation


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Chapter 7 Section 4. Deforming the earth’s crust. The process by which the shape of a rock changes because of stress. Deformation. compression. tension. Stress that occurs when forces act to squeeze an object. Stress that occurs when forces act to stretch an object.

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Deforming the earth’s crust

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Chapter 7 section 4

Chapter 7 Section 4

Deforming the earth’s crust


Deformation

The process by which the shape of a rock changes because of stress.

Deformation


2 types of stress deform rocks

compression

tension

  • Stress that occurs when forces act to squeeze an object

  • Stress that occurs when forces act to stretch an object

2 types of stress deform rocks


Folding

Bending of rock layers due to stress

Folding


3 types of folding

Anticline- upward arching folds

Syncline- downward trough like folds

Monocline- both ends are horizontal but the middle is bent

3 types of folding

2 most common types


Faulting

A break in a body of rock along which one block slides relative to another

You can tell the kind of fault it is by order of sedimentary rock layers.

Faulting


2 major types of faults

Normal Faults

Reverse faults

  • When it moves it causes the hanging wall to move down relative to the footwall

  • Usually occurs when tectonic forces cause tension that pulls rocks apart

  • Causes hanging wall to move up relative to footwall

  • Usually happen when tectonic forces cause compression that pushes rocks together

2 major types of faults


Plate tectonics mountain building

Plate tectonics & mountain building

  • Uplift

    • Rising of regions of Earth’s crust to higher elevations

  • Subsidence

    • Sinking of regions of Earth’s crust to lower elevations


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