Erosion And Sedimentation

Earth Scienceerosionsedimentation
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Erosion And Sedimentation

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  1. Erosion & Sedimentation

    Slide 1 - Erosion & Sedimentation

  2. Erosion & Sedimentation

    Slide 2 - Erosion & Sedimentation

    • We have already taken a good look at how physical weathering can occur. This is the breakdown of rocks by factors such as freezing water, growing tree roots, heat & cooling (exfoliation of granite), abrasion by wind carrying particles of sand and moving water.
  3. Erosion & Sedimentation

    Slide 3 - Erosion & Sedimentation

    • We have also had a look at how some substances in nature can react chemically with rocks, causing them to break down. Acid in rainwater can dissolve away certain kinds of rock.
  4. Erosion & Sedimentation

    Slide 4 - Erosion & Sedimentation

    • Describe how water and wind can move rock particles
    • Explain how the nature of the particles affects how they are moved
    • List the factors that can affect how weathered materials are transported i.e. particle size, density, rate of stream flow, turbulence
    • Describe the process of sedimentation
    • Terms: erosion, weathering, physical weathering, stream flow, expansion, turbulence, gravity, sediments, sedimentation.
  5. Erosion & Sedimentation

    Slide 6 - Erosion & Sedimentation

    • Describe how water and wind can move rock particles
    • Explain how the nature of the particles affects how they are moved
    • List the factors that can affect how weathered materials are transported i.e. particle size, density, rate of stream flow, turbulence
    • Describe the process of sedimentation
    • Terms: erosion, weathering, physical weathering, stream flow, expansion, turbulence, gravity, sediments, sedimentation.
  6. Put the heading “Erosion and Sedimentation” in your notes

    Slide 8 - Put the heading “Erosion and Sedimentation” in your notes

    • Write a definition for the term erosion.
    • Write a sentence to explain what ‘agents of erosion’ means.
    • Use what you saw in the video to create a list of agents of erosion.
    • Write a sentence that explains how gravity is important to erosion.
    • Then come back here.
  7. Slide 9

    • Sedimentation is really important in the formation of new rock at the bottom of the sea.
  8. Put the heading “Erosion and Sedimentation” in your notes

    Slide 11 - Put the heading “Erosion and Sedimentation” in your notes

    • Write a definition for the term sedimentation.
    • Write a sentence to explain where sedimentation usually occurs.
    • Explain how sediments actually come to form in the first place.
    • Then come back here.
  9. Erosion & Sedimentation

    Slide 12 - Erosion & Sedimentation

    • Describe how water and wind can move rock particles
    • Explain how the nature of the particles affects how they are moved
    • List the factors that can affect how weathered materials are transported i.e. particle size, density, rate of stream flow, turbulence
    • Describe the process of sedimentation
    • Terms: erosion, weathering, physical weathering, stream flow, expansion, turbulence, gravity, sediments, sedimentation.
  10. Slide 13

    • The nature of the particles being transported affects how they are transported;
    • Particle size: bigger particles are harder to move than smaller ones
    • Density: the more dense a particle is, the faster it sinks
    • Rate of stream flow: the faster the current, the better the transportation of sediments
    • Turbulence: if the water is turbulent (churned up) then particles of sediment will stay suspended in the water for longer.
  11. If you haven’t quite finished this by the end of the period, then I would like you to finish it for homework. The movie on the next page explains sedimentation in a slightly different way.

    Slide 14 - If you haven’t quite finished this by the end of the period, then I would like you to finish it for homework. The movie on the next page explains sedimentation in a slightly different way.