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Weathering

Weathering. W-E-D Cycle ESRT PAGE 6. The water cycle aides in the Weathering-Erosion-Deposition Cycle. Weathering . Weathering: The breaking down of material at or near the Earth’s surface. Physical Weathering .

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Weathering

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  1. Weathering

  2. W-E-D Cycle ESRT PAGE 6 • The water cycle aides in the Weathering-Erosion-Deposition Cycle

  3. Weathering • Weathering: The breaking down of material at or near the Earth’s surface

  4. Physical Weathering A. Physical (Mechanical) Weathering: Changes in the size and/or shape of a rock without changing the rock’s composition

  5. 1. Ice Wedging/Frost Action: Water in the cracks of rocks freezes -> volume of the water increases->makes cracks larger->water melts & evaporates ->more rock is exposed-> rock begins to break apart

  6. Physical Weathering 2. Plant Action: Tiny root hairs seek out the breaks in rocks ->roots grow and expand causing greater pressure -> breaks the rock further

  7. 3. Exfoliation: Peeling away of large sheets of loosened materials at the surface of a rock due to changes in pressure or temperature

  8. Abrasion 4. Abrasion: The physical wearing down of rocks as they rub or bounce against each other. • Five Natural Agents of Abrasion • Flowing water • Moving ice • Waves • Winds • Gravity

  9. Physical Weathering in Action • Visualization

  10. In Your Own Words (10 mins) • Write the definition of physical weathering in your own words • Draw 4 boxes • In each box, define each type of physical weathering in your own words, or draw an illustration of what happens during each type of weathering

  11. Chemical Weathering B. Chemical Weathering- Changes in the mineral composition of a rock thereby forming new substances. • Oxidation: Occurs when oxygen interacts chemically with minerals. The rusting of iron is an example of oxidation.

  12. 2. Hydrolysis/Water: Occurs when there are chemical reactions between water and minerals

  13. A Famous Example

  14. Dissolution/Acid 3. Dissolution/Acid: Occurs when minerals are “dissolved” over time- surface has a ‘sugary’ feel. Ex. Acid rain and carbonic acid are agents

  15. Chemical Weathering in Action • Chemical Weathering Visualization

  16. In Your Own Words (10 mins) • Write the definition of chemical weathering in your own words • Draw 3 boxes • In each box, define each type of chemical weathering in your own words, or draw an illustration of what happens during each type of weathering

  17. Gravestone: Shale

  18. Gravestone: Granite

  19. Gravestone: Sandstone

  20. Gravestone: Marble

  21. Rates of Weathering • Rates of weathering will be influenced by… 1. Exposed surface area- weathering occurs on the surface. The more surface exposed, the faster weathering will occur.

  22. Rates of Weathering • 2. Mineral composition- some minerals are more resistant than others. For example, quartz is resistant to chemical and physical weathering.

  23. The more resistant a mineral is to weathering, the more time it takes to wear down the material.

  24. Granite vs. Limestone

  25. Rates of Weathering • 3. Climatic conditions- • Warm, wet climates favor chemical weathering. • Cold, wet climates favor mechanical weathering • Dry will have more mechanical

  26. Frost wedging works best in areas where the temperature changes often- going from below freezing to above freezing regularly

  27. Video • https://www.youtube.com/watch?v=R-Iak3Wvh9c

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