Lesson 2 Soil - Weebly

[Pages:70]Chapter Introduction Lesson 1 Weathering Lesson 2 Soil Chapter Wrap-Up

What natural processes break down rocks and begin soil formation?

What do you think?

Before you begin, decide if you agree or disagree with each of these statements. As you view this presentation, see if you change your mind about any of the statements.

Do you agree or disagree?

1. Weathering is the same as erosion.

2. Humans are the main cause of weathering.

3. Plants can break rocks into smaller pieces.

Do you agree or disagree?

4. Air and water are present in soil.

5. Soil that is 1,000 years old is young soil.

6. Soil is the same in all locations.

Weathering

? How does weathering break down or change rock?

? How do mechanical processes break big rocks into smaller pieces?

? How do chemical processes change rocks?

Weathering

? weathering ? mechanical weathering ? chemical weathering ? oxidation

Weathering and Its Effects

? The mechanical and chemical processes that change objects on Earth's surface over time are called weathering.

? Over thousands of years, weathering can break rock into smaller and smaller pieces, such as sand, silt, and clay.

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