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Ch. 11 Notes

Ch. 11 Notes. Deformation of the Crust. How Rock Deforms. Earth’s surface changes constantly Isostasy When lithosphere and asthenosphere are balanced If weight of lithosphere changes, it sinks or rises until there is a balance again. How Rock Deforms. Stress

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Ch. 11 Notes

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  1. Ch. 11 Notes Deformation of the Crust

  2. How Rock Deforms • Earth’s surface changes constantly • Isostasy • When lithosphere and asthenosphere are balanced • If weight of lithosphere changes, it sinks or rises until there is a balance again

  3. How Rock Deforms • Stress • Force exerted on a rock as lithosphere moves • Types of stress: • Compression – squeezes and shortens • Tension – stretches and pulls • Shear stress – parts pushed in opposite directions

  4. How Rock Deforms • Strain • When rock changes its shape or volume because of stress • Stress doesn’t always change a rock, it can “bounce back”

  5. How Rock Deforms • Folds • Bend in rock layers that results from stress • Result of compression or shear stress

  6. How Rock Deforms • Faults • Break in rock where surrounding rock moves • Earthquakes occur along fault lines

  7. Mountain Ranges • Mountain ranges believed to be formed by once active tectonic plates • Results of collisions between: • Continental and oceanic crust • Oceanic crust and oceanic crust • Continental crust and continental crust

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