2.4   External Forces Shaping the Earth
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2.4 External Forces Shaping the Earth

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Wind and rain.

Wind and rain.

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2.4   External Forces Shaping the Earth 2.4 External Forces Shaping the Earth Presentation Transcript

  • External Forces Shaping the Eath
    • Weathering
    • Physical and chemical processes that change the characteristics of rock on or near the Earth’s surface
    • Breaks rock down into smaller pieces called sediment (mud, sand, or silt)
    • 2 types
    • Mechanical Weathering
      • The composition of the rock stays the same, it just gets broken down into smaller bits
    • Chemical Weathering
      • Rock is changed into new substance
      • Rust, acid rain, etc.
    • Erosion
    • Weathered material moved by action of wind, water, ice, or gravity
    • 3 types
    • Water erosion
      • Water strips away material
      • This can happen in rivers and streams by the current eroding the banks and on coasts by waves eroding the shores
      • Eroded material becomes sediment
        • In rivers, sediment is carried downstream and deposited at its mouth and forms a delta
  • Nile Delta Mississippi Delta
    • Wind erosion
      • Powerful winds erode soil and blow them hither and thither.
      • May form new landforms, such as dunes
      • May also just get in your nose and ears in Lubbock
  • Iraq
    • Glacial erosion
      • Large masses of ice eroding the landscape – glaciation
    • Building soil
    • Weathering and erosion are part of the cycle of dirt (my term)
    • Soil gets stripped away and deposited
    • Soil Factors
      • See p. 45 in textbook