Deforming the Earth’s Crust

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Presentation transcript:

Deforming the Earth’s Crust

Deformation This is the process where the shape of rocks change. Caused by: Compression- Objects are squeezed; when 2 plates collide Tension- Objects are stretched; Occurs at divergent plate boundaries.

Faulting Faults are cracks in the Earth’s crust. Each side of the fault are called fault blocks. They are named either a hanging wall or a footwall.

Hanging Wall

Foot Wall

Normal Faults A normal fault occurs when the hanging wall moves down relative to the footwall. Normally occurs when tectonic forces cause tension that pulls rocks apart.

Normal Fault

Reverse Faults Reverse faults causes the hanging wall to move up relative to the footwall. These normally occur when tectonic plates cause compression that push rocks together.

Reverse Fault

Strike Slip Faults Here the rocks break and move horizontally past one another. The San Andreas Fault is a great example of this.

Strike Slip Fault