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Skills Worksheet pages 358-361 Directed Reading A – 12.4 – Answer Key Section: The Effect of Gravity on Erosion and Deposition 1. What is mass movement? Mass movement is the movement of any material, such as rock, soil, or snow downslope. 2. What causes ice, rocks, and soil to move down a slope? Gravity causes ice, rock, and soil to move down a slope. ANGLE OF REPOSE 3. What is the “angle of repose”? The angle of repose is the steepest angle or slope at which loose material will not slide downslope. 4. What are three of the characteristics of a material that will affect its angle of repose? The of the characteristics of a material that affect the angle of repose are size, weight, shape, and moisture level. Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor. Holt Science and Technology 8 Agents of Erosion and Deposition Directed Reading A continued RAPID MASS MOVEMENT Match the correct definition with the correct term. Write the letter in the space provided. Some terms will not be used. E____ 5. a group of loose rocks falling down a steep slope A____ 6. sudden, rapid movement of rock and soil down a slope D____ 7. mudflows of volcanic origin a. b. c. d. e. f. landslide slump mudflow lahar rock fall monsoon C____ 8. rapid movement of a large mass of mud SLOW MASS MOVEMENT C____ 9. Extremely slow movement of material downhill is called a. slump. b. rock fall. c. creep. d. mudflow. 10. What are three factors that affect creep? Three factors that affect creep are water, plant roots, and animals. Water loosens soil and allows it to move. Plant roots wedge rocks and soil apart. Burrowing animals loosen rock and soil. Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor. Holt Science and Technology 9 Agents of Erosion and Deposition