Erosion And Deposition Cynthia

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Text of Erosion And Deposition Cynthia

  • 1. Actions That Change Earths Surface

2.

  • 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)

3.

  • 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

4.

  • Erosion is the transport (movement) of weathered rocks and sediment from one place to another.
  • Erosion is usually gradual
  • Humans can speed it up.

5.

  • Wind
  • Water
  • Waves
  • Glaciers (ice)
  • Gravity (mass movement, mass wasting)

6.

  • What goes up must come down.
  • What is carried must be dropped.
  • Deposition occurs when agents of erosion deposit (lay down, drop) sediment.

7.

  • Sand bars
  • Longshore drift

8.

  • Large mass of moving ice and snow
  • Plucking
  • Abrasion

9.

  • Rapid Mass Wasting
  • Landslide
  • Mudflow

10.

  • Creep
  • Slump

Slow mass wasting 11.

  • Deflation
  • Sand dunes

12.

  • Poor soil conservation

13.

  • Running water
  • Load deposits

14.

  • DeltaAlluvial fan

15.

  • Stalactites and stalagmites