Weathering & Erosion Review Practice Questions – Do your best!

1. Mechanical weathering by plants is most effective A. in a desert. B 1. Mechanical weathering by plants is most effective A. in a desert. B. in a forest. C. in a stream. D. on a mountaintop. 2. Abrasion would be most effective on a rock A. covered with ice. B. with a small surface area. C. in a swiftly flowing stream. D. when temperatures are low. 3. Which models chemical weathering? A. exposing a rock to rain B. freezing a rock in a container of water C. breaking rock into pieces with a hammer D. shaking a container of sand with a rock in it

4. Inorganic components of most soils include A 4. Inorganic components of most soils include A. clay, sand, and bacteria. B. air, water, and minerals. C. partially composed matter. D. parent material and animal waste. 5. In which location would soil form the fastest? A. a plain near the poles B. a forest in a warm climate C. a cold mountainous region D. a gentle slope in a dry climate 6. Which is true? A. All weathering occurs faster near the poles. B. Ice wedging is a minor process of weathering. C. Steep slopes slow down the weathering process. D. Normal water causes the most mechanical weathering.

7. Mechanical weathering is any process that A 7. Mechanical weathering is any process that A. does not form a soil horizon. B. breaks rocks into smaller pieces. C. changes minerals into new ones. 8. Chemical weathering changes the A. size of a rock. B. materials in rock. C. the horizons of a rock. 9. Parent material in soil is in the A. A-horizon. B. B-horizon. C. C-horizon. 10. a) What is an organic material in soil? Dead plants/animals, leaves, animal poo, bacteria, worms

11. a)soil layer with the most organic material HORIZON A 12 11. a)soil layer with the most organic material HORIZON A 12. Rock that undergoes ________________ combines with oxygen from the air. Oxidation 13. A pile of windblown sand is a …. Dune 14. A crumbly, windblown deposit of silt and clay is a… Loess

Matching: 15. a pile of angular rocks and sediment from a rockfall 16. a mixture of various sizes of sediment deposited by a glacier 17. an apron of sediment formed where a stream flows from a steep, narrow canyon onto a plain 18. formed by mineral deposits in caves 19. the sediment deposited by streams that flow from a melting glacier F. Till G. Stalactite H. Alluvial fan I. Outwash J. Talus *KEY* J F H G I

True or False? 1. Mechanical weathering changes the size of a rock. 2. Chemical weathering changes the materials in a rock. 3. Ice wedging is a chemical weathering process. 4. A rock with a great deal of surface area weathers more easily. 5. Weathering prevents plants from getting water and substances it contains. 6. Acid rain causes less chemical weathering than normal rain. 7. Oxidation is a type of mechanical weathering. 8. Dissolving can be an example of chemical weathering. 9. Most types of weathering are slower in cold, dry places. 10. Rocks containing minerals with low hardness undergo *KEY* 1 T. 2.T 3. F 4. T 5. F 6. F 7. F 8. T 9. T 10. T

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