Erosion and Deposition

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Erosion and Deposition
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Breaking Down Processes

• Weathering
• The breaking down of the earths material by
  natural processes.
• Erosion
• The process by which weathered rock and soil
  particles are moved from place to place.
• Deposition
• The process by which weathered sediments are laid
  down in a new location creating new landforms.

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5 Agents of Erosion

• Gravity
• Glaciers
• Wind
• Surface Water / Running Water
• Ocean Shoreline / Ocean Waves

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Gravity

• Pulls rock and soil down a slope
• Called Mass Movement
• Rapid
• Rockslides
• Mudflow
• Avalanche

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Gravity

• Slow
• Slump
• Creep

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Mass Wasting
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Glaciers

• Carry very large to very small debris
• Most powerful agent
• Deposits
• Form piles called moraines
• Drumlins little mounds
• Glacial lakes
• Kettle lakes
• U-shaped valleys

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Moraines
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Drumlins
Glacial lakes
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Kettle Lakes
U-shaped valleys
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Glaciers
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Glacial Erosion
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Wind

• Removes loose material from the earths surface.
• Amount of material carried depends on wind speed
• Most active in deserts, plowed fields, beaches
• Deposits by wind
• Loess- layer of fine silt or sand
• Dunes- mounds of sand

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Loess
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Dunes
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Wind Erosion
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Running Water

• MAJOR CAUSE OF EROSION
• When water moves it carries particle called the
  load.
• Speed of water determines the size of the load
• Creates canyons and valleys
• River deposits
• Delta
• Oxbow lake
• Flood plains

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River deltas
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Oxbow Lakes
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Flood Plains
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Waves

• Constantly erode and shape the shoreline.
• Formation
• Sea cliffs
• Sea stacks and caves

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Sea Stacks
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Sea Stacks cliffs
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Cape Flattery, Olympic Peninsula
Sea caves
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Waves

• Deposits
• Beaches
• Spits
• sand bars
• Barrier Islands

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Barrier Islands
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Spits Sandbars
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Erosion by Brainpop