Erosion I. Erosion a. Weathered material moved from one place to another i. Weathering/weathered material 1. breaking down of rocks on Earth’s surface a. wind, rain, sun, hail, fires, tornadoes, hurricanes, earthquakes, tsunami, landslide/mudflow II. Agents of Erosion a. Running Water b. Glaciers c. Waves sand onto and off of the beach d. Wind sand, dirt and dust e. Gravity III.Deposition a. Weathered material carried by 5 agents i. Running water ii. Glaciers iii. Waves iv. Wind v. Gravity b. Build landforms on Earth Gravity and Erosion I. Gravity a. Pulls things to center of the Earth (ground/floor) i. Causes materials at a higher elevation to move to a lower elevation (down) b. Can cause rivers to flow into ocean c. Mass movement i. Downhill movement of weathered material caused by gravity d. Landslide i. Rapid movement of rocks down a hillside e. Mudflow/Mudslide i. Rapid movement of mud down a hillside Wind and Erosion I. Deflation a. When loose rocks are removed from Earth’s surface by wind i. Most commonly found in: 1. Deserts 2. Plowed fields 3. beaches b. wind=energy II. Abrasion a. Process by which rocks and soil are worn away from particles carried by wind and water. i. Sand paper on rock=abrasion Running Water and Erosion I. Running Water a. Changes Earth’s surface more than any other agent. i. River ii. Waterfalls iii. Streams iv. Runoff 1. rainwater that flows into rivers and streams II. Runoff and Erosion a. Running water carries away soil particles III.Formation of a River a. Usually forms in/on hills or mountains i. Rain=too much water ii. When it cannot soak into the ground createsoverflow iii. Erode soil and forms a channel iv. Channels form streams v. Streams join other streams and form larger streams vi. Form tributaries vii. Streams then form into the main river viii. River System or River