Weathering and erosion
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Weathering and Erosion. Weathering. Is the breakdown of Earth’s crust into smaller pieces. Physical Weathering. Process by which rocks are broken down into smaller pieces by external conditions. Types of Physical weathering Frost heaving and Frost wedging Plant roots Friction and impact

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Weathering and Erosion

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Weathering and Erosion


Weathering

  • Is the breakdown of Earth’s crust into smaller pieces.


Physical Weathering

  • Process by which rocks are broken down into smaller pieces by external conditions.

  • Types of Physical weathering

    • Frost heaving and Frost wedging

    • Plant roots

    • Friction and impact

    • Burrowing of animals

    • Temperature changes


Frost Wedging


Frost Heaving


Plant Roots


Friction and Repeated Impact


Burrowing of Animals


Temperature Changes


Chemical Weathering

  • The process that breaks down rock through chemical changes.

  • The agents of chemical weathering

    • Water

    • Oxygen

    • Carbon dioxide

    • Living organisms

    • Acid rain


Water

  • Water weathers rock by dissolving it


Oxygen

  • Iron combines with oxygen in the presence of water in a processes called oxidation

  • The product of oxidation is rust


Carbon Dioxide

  • CO2 dissolves in rain water and creates carbonic acid

  • Carbonic acid easily weathers limestone and marble


Living Organisms

  • Lichens that grow on rocks produce weak acids that chemically weather rock


Acid Rain

  • Compounds from burning coal, oil and gas react chemically with water forming acids.

  • Acid rain causes very rapid chemical weathering


Karst Topography

  • A type of landscape in rainy regions where there is limestone near the surface, characterized by caves, sinkholes, and disappearing streams.

  • Created by chemical weathering of limestone


Features of Karst: Sinkholes


Features of Karst: Caves


Features of Karst: Disappearing Streams


Erosion

  • The process by which water, ice, wind or gravity moves fragments of rock and soil.


Water Erosion

  • Rivers, streams, and runoff


Ice Erosion

  • Glaciers


Wind Erosion


Mass Movements

  • Landslides, mudslides, slump and creep


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