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Chemical Weathering

Chemical Weathering. Aim: What factors cause chemical weathering?. Describe what you see and hypothesize how it got this way…. What happened to lady liberty?. 1. Chemical weathering. a. Rock is broken down by chemical changes b. Rock is changed to different minerals and becomes weaker.

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Chemical Weathering

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  1. Chemical Weathering Aim: What factors cause chemical weathering?

  2. Describe what you see and hypothesize how it got this way…

  3. What happened to lady liberty?

  4. 1. Chemical weathering a. Rock is broken down by chemical changes b. Rock is changed to different minerals and becomes weaker.

  5. When you think chemical weathering, think chemical changes: Acid, Dissolving, Rusting, Corrosion

  6. 2. Causes of chemical weathering: A. Water B. Oxygen C. Carbon dioxide D. Living organisms E. Acid rain

  7. A. Water ***Most Important Factor*** • Water dissolves minerals in rocks OR • changes the material into a different mineral

  8. Ex. - Caves • Limestone is dissolved by water. Caves, stalactites and stalagmites can form.

  9. Ex. - Sink Holes • Surface water seeps down and dissolves away the rock.

  10. B. Oxidation • Iron combines with oxygen when water is present causing rust • Rock gets soft and crumbly and has a red or brown color

  11. C. Carbonation • Carbon dioxide in air mixes with rainwater forming carbonic acid • Acid reacts with marble and limestone (remember the fizzing mineral!)

  12. D. Living Organisms • Lichens are an organism that will grow on rocks and release an acid that cause chemical weathering.

  13. E. Acid Rain • created when pollution from burning fossil fuels mixes with rain water • Acid rain dissolves rocks over time

  14. Devil’s Marbles • Huge slabs of granite chemically weathered by water in the cracks gives them this rounded appearance.

  15. Lady Liberty • The copper coating on the statue oxidize and turned green • Pennies go through the same chemical change

  16. Which chemical weathering agents may have contributed to Cleopatra’s needle change?

  17. HW Read pgs 42-45Answer question # 4 on pg. 45 and the question below. 4.Why does chemical weathering occur faster in hot wet climates than in cool, dry, climates? How does rock type affect the rate of weathering?

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