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?

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

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

Two types:1. Chemical

-minerals are changed into different substances

2. Mechanical-split or broken into

smaller pieces*no change in composition

RAP 1/23 pg 41. The picture below is an example of

what type of weathering?

2. Explain why you think this.

Types of Chemical Weathering

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oxidation

acid rain

hydrolysis

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Lichen - a symbiosis between algae and fungus. Secretes acid. It is the most important producer

of soil from rock.

RAP 1/24 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 Lab1. In your assigned group, perform TWO

trials of each variable.2. Record your data.3. When finished with ALL four trials, enter

your data into the spreadsheet on teacher computer.

4. Begin answering questions IN YOUR SEAT when done.

RAP 1/25 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

Where do leaves decay faster?

quartzite

Erosion has stripped away the overlying rock and Seneca Rocks have been uplifted

=differential weathering