23-2 Weathering

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23-2 Weathering

  1. 1. Weathering 23.2 Erosion / Weathering
  2. 2. Erosion <ul><li>The process that wears down and carries away rock and soil </li></ul><ul><li>Ex. Grand Canyon </li></ul><ul><li>Destructive process that shapes the Earth surface </li></ul><ul><li>Works through </li></ul><ul><li>Weathering – Gravity </li></ul><ul><li>Streams—Groundwater </li></ul><ul><li>Glaciers—Wind—Waves </li></ul>
  3. 3. Weathering <ul><li>The Process where rocks are </li></ul><ul><li>chemically altered or </li></ul><ul><li>physically broken down into fragments </li></ul>
  4. 4. Mechanical Weathering <ul><li>Mechanical Weathering = Physically breaking rocks </li></ul><ul><li>Frost Wedging </li></ul><ul><ul><li>Water freezes into ice and expands breaking rock </li></ul></ul><ul><li>Abrasion </li></ul><ul><ul><li>Rocks scraping against each other </li></ul></ul>
  5. 5. Mechanical Weathering <ul><li>Plant roots </li></ul><ul><ul><li>Root grow into rock and pry rock apart </li></ul></ul><ul><li>Release of pressure </li></ul><ul><ul><li>Removing excess material allows for expansion of material allow rocks to crack </li></ul></ul>
  6. 6. Chemical Weathering <ul><li>Chemical reactions break down the bonds holding the rocks together, </li></ul><ul><li>causing them to fall apart, </li></ul><ul><li>forming smaller and smaller pieces </li></ul>Acid Rain

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