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Define Erosion and deposition

Published on Nov 18, 2015

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PRESENTATION OUTLINE

1.

EROSION

  • The removal of weathered material from one location to another.
  • Erosion also includes water, wind, glaciers, and gravity
Photo by ecstaticist
2.

THE RATE OF EROSION

  • The factors that affect the rate of erosion are weather,climate,topography,and type of rock
  • Erosion occurs faster on barren land than on land covered with vegetation
Photo by Beth M527
3.

RATE OF EROSION AND ROCK TYPE

  • Weathering can break some types of rocks such as sandstone into larger pieces
  • Weathering will break siltstone or shale into smaller pieces and the small pieces can be removed and transported faster by agents of erosion
  • Large rocks in streams usually move short distances every decade, but silt particles might move a kilometer every day
Photo by VinothChandar
4.

ROUNDING

  • Rock fragments bump against each other during erosion, and when this happens the shapes of the fragments can change
  • The rock fragments can become poorly rounded or well rounded, and the more the rock is well rounded a rock has been more polished during erosion
5.

SORTING

  • The separating of items into groups according to one or more properties
  • Sediment can become sorted by grain size, and sediment is usually well sorted
  • Poorly sorted sediment usually has a rapid transportation,perhaps by a storm
  • Well sorted- Sediment is all about the same size
  • Moderately sorted- Sediment has a small range of sizes
6.

DEPOSITION

  • The laying down settling of eroded material
  • As water or wind slows down it has less energy and can hold less sediment
Photo by lvanvlee8
7.

DEPOSITIONAL ENVIRONMENTS

  • The locations are on land, along coasts, or in oceans
  • The environments where they are transported and deposited are high energy environments
  • Small grains of sediment are often deposited in low energy environments, this occurs in deep lakes
8.

SEDIMENT LAYERS

  • Sediment deposited in water typically forms layers called beds
  • Beds often form as layers of sediment at the bottom of rivers, lakes, and oceans
  • These layers can be preserved by sedimentary rocks
9.

LANDFORMS CREATED BY DEPOSITION

  • They are often flat and low lying, and wind deposition can form deserts of sand
  • Deposition also occurs where mountain streams reach the gentle slopes of wide, flat, valleys
  • Apron of sediment called an alluvial fan, often forms where a stream flows from a steep, narrow canyon onto a flat plain at the foot of a mountain

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