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RAP 1/22 pg. 4

RAP 1/22 pg. 4. What is weathering? As shown below, an empty 1,000.-milliliter container has a mass of 250.0 grams. When filled with a liquid, the container and the liquid have a combined mass of 1,300. grams. What is the density?. RAP 1/23 pg 4.

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RAP 1/22 pg. 4

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  1. RAP 1/22 pg. 4 What is weathering? As shown below, an empty 1,000.-milliliter container has a mass of 250.0 grams. When filled with a liquid, the container and the liquid have a combined mass of 1,300. grams. What is the density?

  2. RAP 1/23 pg 4 • The picture below is an example of what type of weathering? 2. Explain why you think this.

  3. Topic: Weathering, Soil and Erosion • Chapter 12 in book • Section: 12.1 - Weathering • Section: 12.2 - Soil • Section: 12.3 - Mass Movements & Erosion • Section: 12.4 - Soil as a Resource

  4. Weathering: breakup of rock due to exposure to processes that occur on Earth’s surface

  5. Two types: • Chemical -minerals are changed into different substances • Mechanical -split or broken into smaller pieces *no change in composition

  6. Breakdown of rock by grinding action Mechanical

  7. Water freezes in the cracks of rocks and expands Mechanical

  8. Root Pry

  9. Lichen - a symbiosis between algae and fungus. Secretes acid. It is the most important producer of soil from rock.

  10. Roots pry open crackx Mechanical Chemical Lichen secrete acid

  11. Peeling of surface layers Mechanical

  12. Reaction of water with other substances Chemical

  13. Dissolves minerals like calcite and rocks like limestone Chemical

  14. 1968 1908

  15. Reaction of oxygen with other substances Example: rust Chemical

  16. Types of Chemical Weathering ?????????? oxidation ?????????? acid rain ?????????? hydrolysis

  17. RAP 1/29 pg 4 • Which rock was most likely found in the bottom of a riverbed? 2. What type of weathering is responsible for the river rock?

  18. Alka Seltzer Lab • Follow along with teacher demonstrations. • Answer Alka Seltzer Analysis Questions on pg. 6 (Due 1/30)

  19. RAP 1/30 pg. 8 • In the alka seltzer lab, what two things changed the weathering rates? • Which substance plays the most important role in chemical weathering?

  20. Weathering Quiz (1/30)

  21. Rates of Weathering • Surface Area • Climate • Composition a. More surface exposure = faster a. Wet = faster; Dryer = slower a. Faster = shale; Slower = quartz

  22. Where do leaves decay faster?

  23. Erosion has stripped away the overlying rock and Seneca Rocks have been uplifted quartzite =differential weathering

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