Types of weathering

Types of weathering

• 1.
  Types of Weathering KimBennison Katy Hogan Alex Gage Kelly Fischer
• 2.
  Mechanical/Physical Weathering • Exfoliation •Ice Wedging • Organic Wedging • Abrasion
• 3.
  Exfoliation When a rockhas heat exerted upon it, along with pressure, it separates into layers.
• 4.
  Ice Wedging When waterleaks into the cracks of rocks, it freezes and causes the rock to crack.
• 5.
  Organic Activity This occurswhen burrowing animals, humans, or plants interfere and work their way into rocks.
• 6.
  Abrasion Abrasion occurs whenrocks rub against eachother and become rounded.
• 7.
  Chemical Weathering • Hydrolysis •Oxidation • Dissolution • Acid – Carbonation – Precipitation – Plant Acid
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  Hydrolysis When rocks sitin water for extended periods of time they begin to break down and have a clay-like texture.
• 9.
  Oxidation When oxygen reactswith iron in rocks, they rust, taking on a red-orange color.
• 10.
  Dissolution Rocks, when inwater, react with acids in the water and dissolve. A clue that this has happened to a rock is the presence of small holes.
• 11.
  Acid 1 • Carbonation-water absorbs carbon dioxide when rain falls or from decaying organic material. The carbon dioxide dissolved in water forms carbonic acid that reacts with many common minerals.
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  Acid 2 • Precipitation-Water in the atmosphere absorbs sulfur oxides and nitrogen oxides. Through a series of chemical reactions these pollutants are converted into acids that are a cause of acid precipitation.
• 13.
  Acid 3 • PlantAcid- When plants decay they release acids that react with the minerals in rocks.