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Types of weathering
- 1. Types of Weathering Kim Bennison Katy Hogan Alex Gage Kelly Fischer
- 2. Mechanical/Physical Weathering • Exfoliation • Ice Wedging • Organic Wedging • Abrasion
- 3. Exfoliation When a rock has heat exerted upon it, along with pressure, it separates into layers.
- 4. Ice Wedging When water leaks into the cracks of rocks, it freezes and causes the rock to crack.
- 5. Organic Activity This occurs when burrowing animals, humans, or plants interfere and work their way into rocks.
- 6. Abrasion Abrasion occurs when rocks rub against eachother and become rounded.
- 7. Chemical Weathering • Hydrolysis • Oxidation • Dissolution • Acid – Carbonation – Precipitation – Plant Acid
- 8. Hydrolysis When rocks sit in water for extended periods of time they begin to break down and have a clay-like texture.
- 9. Oxidation When oxygen reacts with iron in rocks, they rust, taking on a red-orange color.
- 10. Dissolution Rocks, when in water, 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.
- 12. 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 • Plant Acid- When plants decay they release acids that react with the minerals in rocks.