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

Sinkholes

Landslides

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