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Earth science 5.1


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Earth science 5.1

  1. 1. 5.1 Weathering
  2. 2. Mechanical Weathering• The physical disintegration of rock, resulting in smaller fragments
  3. 3. Frost wedging• The mechanical breakup of rock caused by the expansion of freezing water in cracks and crevices
  4. 4. Talus• An accumulation of rock debris at the base of a cliff
  5. 5. Exfoliation• Type of weathering caused by reducing pressure on a rock surface, allowing slabs of outer rock to break off in layers
  6. 6. Chemical weathering• The process by which the internal structure of a mineral is altered by the removal and/or addition of elements
  7. 7. Key Concept• Mechanical weathering occurs when physical forces break rock into smaller and smaller pieces without changing the rock’s mineral composition.
  8. 8. Key Concept• In nature, three physical processes are especially important causes of mechanical weathering: frost wedging, unloading, and biological activity.
  9. 9. Key Concept• Chemical weathering is the transformation of rock into one or more new compounds
  10. 10. Key Concept• Two others factors that affect the rate of weathering are rock characteristics and climate