1. RAP 1/22 pg. 4 What is weathering?
As shown below, an empty 1,000.-milliliter container has a mass of 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/ 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: Weathering
Section: Soil
Section: Mass Movements & Erosion
Section: Soil as a Resource

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

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

8. 1. Abrasion
Breakdown of rock by grinding action
Mechanical

9. Water freezes in the cracks of rocks and expands Mechanical
2. Frost Wedging
Water freezes in the cracks of rocks and expands
Mechanical

10. Root Pry

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

12. Roots pry open crackx Mechanical Chemical Lichen secrete acid
3. Plant and Animal Activity
Roots pry open crackx
Mechanical
Chemical
Lichen secrete acid

13. Peeling of surface layers Mechanical
4. Exfoliation
Peeling of surface layers
Mechanical

14. Reaction of water with other substances Chemical
5. Hydrolysis
Reaction of water with other substances
Chemical

15. Dissolves minerals like calcite and rocks like limestone Chemical
6. Acids
Dissolves minerals like calcite and rocks like limestone
Chemical

17. 1908
1968

19. Reaction of oxygen with other substances
7. Oxidation
Reaction of oxygen with other substances
Example: rust
Chemical

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

22. RAP 1/ 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?

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

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

25. Weathering Quiz (1/30)

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

28. Where do leaves decay faster?

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