Erosion

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Erosion Deposition
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DEFINITIONS
Erosion Brainstorm 1) What is it? 2) What can cause it? 3) How does erosion change the surface of the Earth? - Possible Types
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EROSION

• Erosion movement of sediment by
• ice, wind, water, or gravity
• Is erosion constructive, destructive, or both?
  Why?

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Erosion is a destructive force.

• Erosion wears down Earths surface

gully
river valley
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CAUSES of EROSION

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

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ICE EROSION EFFECTS
ICE a. U shaped Valley b. Flat Plains
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CAUSES of EROSION

• WIND carries
• (blows) sediments and soil from one place to
  another

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WIND EROSION EFFECTS

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

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EROSION EFFECTS
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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

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WATER EROSION EFFECTS
KARST Landscape
Karst is an area of land that is mostly made of
limestone because of this usually has a lot of
caves sinkholes.
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WATER EROSION EFFECTS
caves
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WATER EROSION EFFECTS
Caves are formed when rock is chemically
dissolved and carried away by groundwater or
underground rivers leaving holes in the rock.
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WATER EROSION EFFECTS
Sinkholes form when the rock underneath the soil,
is eroded away the and above sinks because it
is no longer supported
sinkholes
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WATER EROSION EFFECTS
River valleys canyons are formed when fast
moving rivers erode the land over long periods of
time.
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EROSION EFFECTS
Floodplains are formed over time when a river or
stream overflows its regular banks and erodes the
land around it.
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CAUSES of EROSION

• Gravity
• Causes water and glaciers to move downhill
• particles (sediments, dust, soil, etc.) carried
  by water and wind to settle on bottom on stream
  or the ground

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GRAVITY EROSION EFFECTS
Mass Movement
Mudflows
Landslides
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DEFINITIONS
Deposition Brainstorm 1) What is it? 2) How can deposition change the surface of the Earth? -
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Deposition

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

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Deposition

• Deposition is constructive because it builds up
  Earths surface

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DEPOSITION NONLIVING CAUSES
ICE Glaciers deposit sediments as they begin to
melt (recede)
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DEPOSITION EFFECTS
ICE -moraines -lakes -hills
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FORCES OFEROSION DEPOSITION

• WIND
• When the wind slows down, the sediments are
  deposited
• The heaviest
• sediments are
• dropped first

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Deposition Effects

• Wind
• Sand dunes

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DEPOSITION NONLIVING CAUSES
WATER
-When the water slows down, the heaviest
sediments are deposited first
Older rivers have curves called meanders.
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• Canarvon Gascoyne Delta Shark Bay W Australia

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DEPOSITION EFFECTS

• WATER

sandbar
delta
beach
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DEPOSITION EFFECTS

• FLOODPLAINS

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DEPOSITION EFFECTS
WATER
stalagmites, stalactites (ground) (ceiling)
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Constructive and Destructive Forces Review

• Destructive
• Forces that tear down/wear away Earths surface
• Examples
• Weathering
• Erosion

• Constructive
• Forces that build up Earths surface
• Example
• Deposition