Weathering

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WHAT IS WEATHERING?

Weathering is the breakdown of rock insitue (no movement). There are 3 different types of weathering 

BIOLOGICAL

PHYSICAL WEATHERING

CHEMICAL WEATHERING

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BIOLOGICAL WEATHERING

the breakdown of rock in situe due to biological processes:

  • bacteria
  • tree roots
  • animals burrowing

PRODUCTS OF BIOLOGICAL WEATHERING:

  • rock fragments (scree)
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PHYSICAL WEATHERING

  • Freeze thaw/ frost shattering (water freezes inside a joint and expands by 9% inside the joint so it can seep deeper into the rock when it melts, repeated freeze-thaw action makes the joint expand so much that rocks break off and fall off into piles of scree)
    • Exfoliation (minerals expand when heated and contract when cooled, repeated expansion and contraction weaken the rock so the outside of the rock "peels off" in layers)

PRODUCTS OF PHYSICAL WEATHERING

  • rock fragments (scree)
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CHEMICAL WEATHERING

  • Carbonation (rain water picks up carbon dioxide and becomes slightly acidic, this dissolves calcite/limestone)
  • Oxidation (reaction of iron rich rocks with oxygen)
  • Hydrolysis (reaction of rock with water, important for feldspars)

PRODUCTS OF CHEMICAL WEATHERING

  • ions in solution
  • new mineral
  • resistant materials
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