Forces in earth s crust part 1
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Forces in Earth’s Crust Part 1 PowerPoint PPT Presentation


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Forces in Earth’s Crust Part 1. Stress : a force that acts on rock to change its shape or volume *The movement of Earth’s plates creates an enormous force that squeezes or pulls the rock in the crust . Three different types of stress can occur in the crust:. 1) Tension 2) Compression

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Forces in Earth’s Crust Part 1

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Forces in Earth’s Crust Part 1


Stress: a force that acts on rock to change its shape or volume*The movement of Earth’s plates creates an enormous force that squeezes or pulls the rock in the crust


Three different types of stress can occur in the crust:

  • 1) Tension

  • 2) Compression

  • 3) Shearing


Types of Stress


Tension

*a stress force that pulls on the rock, stretching it so that it becomes thinner in the middle

*occurs when two plates are moving apart


Compression

  • Squeezes rock until it folds or breaks

  • One plate pushing against another can compress rock like a giant trash compactor


Shearing

  • Stress that pushes a mass of rock in two opposite directions

  • Can cause rock to break and slip apart or to change shape


What is a Fault?

  • When a rock breaks as a result of stress build-up in the rock

  • A fault is a break in the rock of the crust where rock surfaces slip/grind past each other

  • Rocks on either side of a fault can move up, down, or sideways.


3 Types of Faults

  • Normal Faults

  • Reverse Faults

  • Strike-slip Faults


Normal Fault


Normal Fault


Normal Fault

  • Tension in the Earth’s crust pulls rock apart

  • The fault is at an angle, so one block of rock lies above the fault line while the other block lies below the fault line

  • Hanging Wall: The block of rock that lies above the fault line

  • Footwall: The block of rock that lies below the fault line


Normal Fault

  • When movement occurs along a normal fault, the hanging wall slips downward

  • Normal faults are found along the Rio Grande rift valley in New Mexico


Normal Fault


Normal Fault


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