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2-1: Earth’s Crust in Motion

2-1: Earth’s Crust in Motion. 2-1: Earth’s Crust in Motion. Stress. force that acts on rock changes rock’s shape & volume adds energy to rock  energy stored in rock  rock breaks OR  changes shape. shaking & trembling due to movement beneath surface. Earthquake.

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2-1: Earth’s Crust in Motion

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  1. 2-1: Earth’s Crust in Motion

  2. 2-1: Earth’s Crust in Motion Stress force that acts on rock changes rock’s shape & volume adds energy to rock  energy stored in rock  rock breaks OR  changes shape shaking & trembling due to movement beneath surface • Earthquake

  3. 3 Types of Stress • 1. shearing  • 2. tension  • 3. compression  • pushes in 2 opposite directions • s-t-r-e-t-c-h-e-s rock (gets thinner in middle) • squeezes rock until it folds or breaks

  4. Deformation • Fault • 3 types of fault • 1. strike-slip fault • 2. normal fault 3. reverse fault • Any change in volume of shape of Earth’s crust • Occurs s-l-o-w-l-y – over millions of years • Caused by slow shift of Earth’s plates • a break in Earth’s crust • where slabs of rock slip past each other • up • down • sideways • usually occur near plate boundaries • caused by shearing (can be a transform boundary) • caused by tension • caused by compression

  5. 3 Types of Stress

  6. 3 Types of Fault Caused by Shearing Caused by Compression Caused by Tension

  7. Don’t get Faults and Stresses mixed up with Plate Boundaries! (Three of each!) Divergent Convergent Transform

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