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Faults and Folds

Faults and Folds. Unit 2: Tectonic Process Ms. Thind. Faulting: . Rocks under pressure or tension fracture under strain If movement takes place along a fracture a rift is formed  faulting

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Faults and Folds

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  1. Faults and Folds Unit 2: Tectonic Process Ms. Thind

  2. Faulting: • Rocks under pressure or tension fracture under strain • If movement takes place along a fracture a rift is formed  faulting • Landforms produced by faulting: Normal Fault, Reverse or Thrust Fault, Rift Valley or Graben, and Block Mountain or Horst

  3. Normal Fault • Along the line of a fault one section of rock may be forced down to create a faultscarp (fault cliff) • Tension (think stretching of rock) results in a normal fault What does this look like? *take out a sheet of paper*

  4. http://www.fossweb.com/CA/modules3-6/SolidEarth/activities/geologylab/faultingandfolding/earth-processes/faulting.htmhttp://www.fossweb.com/CA/modules3-6/SolidEarth/activities/geologylab/faultingandfolding/earth-processes/faulting.htm

  5. Reverse or Thrust Fault • Along the line of a fracture one section of rock is pushed upward as a result of compression (pushing together) http://www.fossweb.com/CA/modules3-6/SolidEarth/activities/geologylab/faultingandfolding/earth-processes/faulting-r.htm What does this look like?

  6. Block Mountain or Horst • Blocks that have been elevated on a much larger scale form mountain ranges called fault block mountains or horsts formed by tension What does this look like?

  7. Rift Valley or Graben • Faulting may cause blocks to slip down and form steep sided rift valleys called grabenscaused by tension What does this look like?

  8. Folding • When two tectonic plates collide the rock layers fold and squeeze together over a long period of time because of increasing pressure • Upfolds are called anticlines • Downfolds are called synclines

  9. http://www.classzone.com/books/earth_science/terc/content/investigations/es1106/es1106page02.cfmhttp://www.classzone.com/books/earth_science/terc/content/investigations/es1106/es1106page02.cfm

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