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RAP 1/22 pg. 41. What is weathering?2. 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 41. The picture below is an example of
what type of weathering?
2. Explain why you think this.
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
Two types:1. Chemical
-minerals are changed into different substances
2. Mechanical-split or broken into
smaller pieces*no change in composition
Lichen - a symbiosis between algae and fungus. Secretes acid. It is the most important producer
of soil from rock.
RAP 1/29 pg 41. Which rock was most likely found in
the bottom of a riverbed?
2. What type of weathering is responsible for the river rock?
Alka Seltzer Lab
1. Follow along with teacher demonstrations.
2. Answer Alka Seltzer Analysis Questions on pg. 6 (Due 1/30)
RAP 1/30 pg. 8
1.In the alka seltzer lab, what two things changed the weathering rates?
2. Which substance plays the most important role in chemical weathering?
Rates of Weathering1. Surface Area
2. Climate
3. Composition
a. More surface exposure = faster
a. Wet = faster; Dryer = slower
a. Faster = shale; Slower = quartz