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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?. Topic: Weathering, Soil and Erosion. Chapter 12 in book

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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. 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

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

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

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

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

  7. 1968 1908

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

  9. RAP 1/24 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?

  10. Alka Seltzer Lab • In your assigned group, perform TWO trials of each variable. • Record your data. • When finished with ALL four trials, enter your data into the spreadsheet on teacher computer. • Begin answering questions IN YOUR SEAT when done.

  11. RAP 1/25 pg. 8 • In the alka seltzer lab, what two things changed the weathering rates? • Which substance plays the most important role in chemical weathering?

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

  13. Where do leaves decay faster?

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

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