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Weathering and Erosion

Weathering and Erosion. Amole Spectra of Science 2013. Weathering vs. Erosion. Weathering is like the hammer. They work together, but are NOT the same thing Weathering is a process that breaks down rock Erosion is a process that moves rock. Erosion is like the truck.

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Weathering and Erosion

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  1. Weathering and Erosion Amole Spectra of Science 2013

  2. Weathering vs. Erosion Weathering is like the hammer. • They work together, but are NOT the same thing • Weathering is a process that breaks down rock • Erosion is a process that moves rock Erosion is like the truck.

  3. Types of Weathering • Physical- breaks down rock without changing its chemical composition • Frost wedging • Plant roots • Wind • Water • Chemical-breaks down rock by changing its chemical composition • CO2 • Acid Precipitation • Rust

  4. Frost Wedging • Physical Weathering • Water seeps into cracks • Freezes and expands • Pushes rock apart

  5. Root Pry • Physical Weathering • Plant roots grow into rock • Pushes rock apart

  6. Wind Abrasion • Physical Weathering • Wind carrying sand blasts against these rocks causing them to become rounded

  7. Animal Burrows • Physical Weathering • Animals create tunnels in rock and sediments breaking them up

  8. Water Abrasion • Physical Weathering • Running water repeatedly flows over river rocks making them smooth

  9. Oxidation of Iron • Chemical Weathering • This rock is red because of the oxidation of iron in the sediment when the rock was being formed

  10. Acid Precipitation • Chemical Weathering • Released gases from burning fossil fuels react with water in the air to create acids • This acid reacts with limestone to decompose it 19081969

  11. Living Organisms • Lichens that grow on rocks produce weak acids that chemically weather rock

  12. Water • Chemical Weathering • Water can dissolve minerals found in rocks

  13. Water • Chemical Weathering • Water can dissolve minerals found in rocks

  14. Carbon Dioxide • Chemical Weathering • Reacts with water to form acid

  15. Erosion • Process by which rock is moved or transported • Deposition- process by which material (sediments) are laid down

  16. Water Erosion • Water transports and then eventually deposits sediments • Can create deltas, meanders, canyons, and flood plains

  17. Meander • S-shaped streams • Wander side to side seeking lowest elevation

  18. Delta • Occur where rivers meet the ocean • Soil, dirt, sediments deposited at river mouth • Creates new soil-rich land

  19. Canyons • Large valleys created by rivers or streams over time • Grand Canyon “cut” by Colorado River

  20. Wind Erosion • Wind picks up and carries sediments to new locations • Creates sand dunes

  21. Erosion by Gravity • Gravity causes large masses off rocks and sediments to move from higher locations to lower ones • Ex: avalanches, land slides, and mudslides

  22. Erosion by Ice • Glaciers carve U-shaped valleys as they pick up and carry rock fragments along the way

  23. Weathering and Erosion QUIZ

  24. Frost WedgingPhysical Weathering

  25. Chemical weatheringRust

  26. Root PryPhysical Weathering

  27. Water Erosion

  28. Erosion by Glacier

  29. Erosion by Gravity

  30. Erosion by Gravity

  31. Physical Weathering- Frost WedgingErosion- Wind

  32. Chemical Weathering- Acid Precipitation The marble grave marker has been attacked by acidic rain because of the calcite composition. The grave marker on the right, while old, has not been dissolved because of its granite composition

  33. Physical Weathering-Tree PryErosion by Gravity

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