Erosion & Deposition

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Erosion & Deposition. DEFINITIONS. EROSION. Erosion= movement of sediment by ice, wind, water, or gravity Is erosion constructive, destructive, or both? Why?. Erosion wears down Earth’s surface. Erosion is a destructive force. gully. river valley. Ice (Glaciers) - PowerPoint PPT Presentation

Text of Erosion & Deposition

  • Erosion & Deposition

  • DEFINITIONS

    Erosion

    Brainstorm:

    1) What is it?

    2) What can cause it?

    3) How does erosion change the surface of the Earth?-

    Possible Types:

  • EROSIONErosion= movement of sediment by ice, wind, water, or gravityIs erosion constructive, destructive, or both? Why?

  • Erosion wears down Earths surfacegullyErosion is a destructive force.river valley

  • CAUSES of EROSION

    Ice (Glaciers) Glaciers carry materials along as they move forward

  • ICE EROSION EFFECTSICEa. U shaped Valleyb. Flat Plains

  • CAUSES of EROSIONWIND carries (blows) sediments and soil from one place to another

  • WIND EROSION EFFECTSWIND a.Reshaped surfaces b.Sand storms c.Dust storms

  • EROSION EFFECTS

  • CAUSES of EROSION

    Moving water in streams & rivers carries sediments along as it moves down stream.The faster the water, the more and the heavier material it can carry

  • WATER EROSION EFFECTSKARST LandscapeKarst is an area of land that is mostly made of limestone & because of this usually has a lot of caves & sinkholes.

  • WATER EROSION EFFECTScaves

  • WATER EROSION EFFECTSCaves are formed when rock is chemically dissolved and carried away by groundwater or underground rivers leaving holes in the rock.

  • WATER EROSION EFFECTSsinkholesSinkholes form when the rock underneath the soil, is eroded away & the and above sinks because it is no longer supported

  • WATER EROSION EFFECTSRiver valleys & canyonsare formed when fast moving rivers erode the land over long periods of time.

  • EROSION EFFECTSFloodplains are formed over time when a river or stream overflows its regular banks and erodes the land around it.

  • CAUSES of EROSIONGravityCauses water and glaciers to move downhillparticles (sediments, dust, soil, etc.) carried by water and wind to settle on bottom on stream or the ground

  • GRAVITY EROSION EFFECTSMudflowsLandslidesMass Movement

  • DEFINITIONS

    Deposition

    Brainstorm:

    1) What is it?

    2) How can deposition change the surface of the Earth?-

  • DepositionDeposition= build up of land through the dropping off of sediments that are being carried by ice, wind, water or gravityIs deposition constructive, destructive, or both? Why?

  • DepositionDeposition is constructive because it builds up Earths surface

  • DEPOSITION NONLIVING CAUSESICE Glaciers deposit sediments as they begin to melt (recede)

  • DEPOSITION EFFECTSICE-moraines-lakes-hills

  • FORCES OFEROSION & DEPOSITIONWIND When the wind slows down, the sediments are depositedThe heaviestsediments are dropped first

  • Deposition EffectsWindSand dunes

  • DEPOSITION NONLIVING CAUSESWATER-When the water slows down, the heaviest sediments are deposited firstOlder rivers have curves called meanders.

  • Canarvon Gascoyne Delta Shark Bay W Australia

  • DEPOSITION EFFECTSWATERdeltasandbarbeach

  • DEPOSITION EFFECTSFLOODPLAINS

  • DEPOSITION EFFECTS

    stalagmites, & stalactites (ground)(ceiling) WATER

  • Constructive and Destructive Forces ReviewDestructiveForces that tear down/wear away Earths surface

    Examples:Weathering ErosionConstructiveForces that build up Earths surface

    Example:Deposition

    *Have students discuss these questions as a class. Then have the students choose an appropriate definition to write. (Guide them to correct definition). The write down some of the possible causes that the students think cause weathering.*Have students discuss these questions as a class. Then have the students choose an appropriate definition to write. (Guide them to correct definition). The write down some of the possible causes that the students think cause weathering.