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#15 Erosion
1. Erosion ...the movement of weathered material like gravel, soil, and sand ...the movement of weathered material like gravel, soil, and sand The Chief Causes of Erosion are WATER WIND and GLACIERS
2. Sand Dunes in Death Valley Where did all of this sand originate?
3. WATER as a form of Erosion Moving water in rain, rivers, streams and oceans is greatest cause of erosion Water carries Sediment that scours surfaces as it flows over them Crashing waves erode beaches, cliffs, bluffs; also pile up sand dunes Currents move sand dunes and barrier islands
4. Water Erosion on the Duckabush River in the Olympic Mountains in Olympic National Park in Washington
5. Second main cause of erosion Dries out land and blows topsoil away Sandstorms sand blast rock formations and buildings WIND as a form of Erosion Conversely, can also blow nutrient rich loess (dust and silt) into place
6. GLACIERS as a form of Erosion Glaciers are large, slow-moving sheets or rivers of ice that scour out wide, u-shaped valleys. They leave behind Moraines when they retreat. Moraines can act like dams and hold in water to form glacial lakes.