Flashcards › Erosion and Deposition - 6th Grade

erosion the process by which natural forces move weathered rock and soil from one place to another sediment pieces of rock or soil or the remains of plant and animals deposition the agents of erosion deposit, or lay down, sediment cycle of erosion and deposition over millions of years, erosion gradually wears away mountains while deposition fills in valleys with sediment gravity the force that moves rock and other materials downhill mass movement landslides, mudflows, slump and creep which move sediment downhill 5 agents of erosion gravity, running water, glaciers, waves and wind agent a force or material that causes change in Earth's surface landslides a mass movement that occurs when rock and soil slide rapidly down a steep slope. mudflows a rapid downhll movement of a mixture of water, rock, and soil. slump a mass movement in which a mass of rock and soil rapidly slips down a slope in ONE LARGE mass. creep a very SLOW downhill mass movement of rock and soil. major agent of erosion water running downhill runoff water that moves over Earth's surface 5 factors for the amount of runoff amount of rain, vegetation, type of soil, shape of land, how people use the land rills tiny grooves in the soil caused by runoff gully large groove in the soil formed by runoff stream gullies joined together to form a larger channel along which water is continually flowing down a slope river a large stream energy the ability to do work or cause change through erosion, a river creates these features valleys, waterfalls, flood plains, meanders and oxbow lakes flood plain the flat, wide area of land along a river meander a loop-like bend in the course of a river oxbow lake a meander that has been cut off from the river alluvian fan wide, sloping deposit of sediment formed where a stream leaves a mountain range delta a landform build from sediment deposited where a river flows into an ocean or lake bluffs erosion forms cliffs along the edge of a flood plain V-shaped valley the result of a fast flowing river in which the steep slopes along the river erode rapidly factors that determine the power of the river to cause erosion a river's slope, volume of flow, and the shape of its streambed load the amount of sediment that a river carries slope the amount the river drops toward sea level over a given distance volume of flow the amount of water that moves past a point on the river in a give time streambed shape the flow of a river - straight line or curved line tributary a smaller river or streat that flows into a larger river landforms created by depositions from rivers alluvian fans, deltas, adds soil to flood plains headlands part of the shore that sticks out into the ocean waves major force of erosion along coasts features created by waves beaches, spits, sandbars and barrier beaches beach an area of wave-washed sediment along a coast; formed as waves pile up sand along the shore longshore drift process when waves repeatedly hit the beach and sediment moves down the beach with the current sea stack rock left standing when a sea arch collapses sea arch fromed when sea caves on either side of a headland join sea cave formed as wave action hollows out the cliff spit formed as longshore drift deposits sand along the shore (looks like a finger) sand bars long ridges of sand parallel to the shore barrier beaches long, narrow island formed when storm waves pile up large amounts of sand above sea level sand dune a deposit of wind-blown sand and come in many shapes and sizes deflation the process by which wind removes surface materials abrasion the grinding away of rock by other rock particles carried in water, ice, or wind loess a wind-formed deposit made of fine particles of clay and silt Prentice Hall Focus on California Earth Science Chapter 3 includes: Changing Earth's Surface, Water Erosion, Waves and Wind