Erosion And Deposition Cynthia
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- 1. Actions That Change Earths Surface
- The physical or chemical processes that break down (wear away) rocks
- Agents of weathering: wind, water, ice, gravity, plants and animals (biologic)
- Mechanical weathering: ice wedging, root pry, abrasion (grinding), exfoliation, animals, and thermal expansion
- Chemical weathering: oxidation (iron + oxygen + water = rust), acidic precipitation (from burning fossil fuels: sulfur, carbon dioxide, and nitrogen), plant acids (lichens and mosses) carbonic acids (marble and limestone), hydrolysis (feldsapar to clay), and dissolution (water)
- The type of rock: mineral composition
- Surface area: smaller rocks have a greater surface area (consider volume) and weather faster
- Climate (temperature and precipitation): hot/warm and wet/humid weather fastest
- Erosion is the transport (movement) of weathered rocks and sediment from one place to another.
- Erosion is usually gradual
- Gravity (mass movement, mass wasting)
- What goes up must come down.
- What is carried must be dropped.
- Deposition occurs when agents of erosion deposit (lay down, drop) sediment.
- Large mass of moving ice and snow
Slow mass wasting 11.
- Stalactites and stalagmites