Erosion and Deposition

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EROSION AND DEPOSITION
MADE BY BIBHAB SAHA Class 7
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• What is Erosion?
• Erosion The moving of rock material from one
  place to a new location. Weathering has to happen
  before erosion. The rocks have to be broken into
  smaller sediments before they can be eroded away

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AGENTS OF EROSION

• Wind This is when loose soil particles are
  collected by the wind and transported to another
  location.
• Flowing water Water erosion is the removal and
  transportation of soil, sediment, or mineral
  components of a rock by a moving, liquid water
  source.
• Waves Wave erosion creates retrograde, or
  retreating, shorelines with sea cliffs, wave-cut
  benches at the base of the sea cliffs, and sea
  archescurved or rectangularly shaped archways
  that result from different rates of erosion due
  to varied bedrock resistance.
• Gravity Downward movement of rock and
  sediments, mainly due to the force of gravity
• Moving Ice (glaciers) Movement of soil or rock
  from one point to another by the action of the
  moving ice of a glacier. Also known as ice
  erosion.

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What is Deposition?

• Deposition It is the process where sediments are
  released/dropped by their agent of erosion
• Process of erosion stops
• -when the moving particles fall out of the
  transporting medium and settle on a surface
• Speed of the medium slows or the resistance of
  the particles increases, the balance changes and
  causes deposition
• Speed can be reduced by large rocks, hills,
  vegetation, etc.

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Agents of Deposition

• Wind All the sediment picked up by wind
  eventually falls back to the ground. This happens
  when the wind slows down or some obstacle, such
  as a boulder or a clump of grass, traps the
  windblown sand sediment. 
• Water As water moves, it carries sediment with
  it. Anytime moving water slows down, it drops, or
  deposits, some of the sediment. As the water
  slows down, fine particles fall to the river's
  bed. Now the larger stones quit rolling and
  sliding
• Ice A glacier gathers a huge amount of rock
  and soil as it erodes the land in its path. When
  a glacier melts, it deposits the sediment it
  eroded from the land, which creates a variety of
  landforms.

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Whats the Difference?

• WEATHERING Think of weather wearing rock
  down.
• EROSION Think of a road and travelling.
• DEPOSITION Think of depositing money into a
  bank.