Wearing Down Earth’s SurfaceChapter 1Lesson 2
Mechanical Weathering
Chemical Weathering
Erosion
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
Questions & Answers1. Describe three ways mechanical weathering my occur.
Water can trickle into the cracks of rocks and freeze, breaking rocks apartWind or rushing water hitting rocks can cause the rocks to weaken and crack or crumblePlant 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.
Wearing Down Earth’s SurfaceChapter 1Lesson 2
Review
A destructive force that breaks down rocks into smaller pieces
WeatheringA 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
