1. Wearing Down Earth’s Surface Chapter 1 Lesson 2

2. Mechanical Weathering

3. Chemical Weathering

4. Erosion

5. Vocabulary  Erosion- destructive force in which pieces of rock are moved by water, wind, or moving ice  Sediment- small pieces of rock  Weathering- destructive force that breaks down rocks into smaller pieces

6. Questions & Answers 1. Describe three ways mechanical weathering my occur. Water can trickle into the cracks of rocks and freeze, breaking rocks apart Wind or rushing water hitting rocks can cause the rocks to weaken and crack or crumble Plant roots can break rocks as the plant grows 2. How can water from the surface create a cave? Acidic water dissolves minerals in rock and makes holes 3. How does slow moving water form a valley? A stream slowly erodes a river channel. The stream grows into a river, and carries sediments away from its V-shaped valley.

7. Wearing Down Earth’s Surface Chapter 1 Lesson 2

8. Sinkholes

9. Landslides

10. Review A destructive force that breaks down rocks into smaller pieces Weathering A destructive force in which pieces of rock are moved by water, wind, or moving ice Erosion Small pieces of rock Sediment Mechanical Weathering Chemical Weathering Erosion Sinkhole Landslide