Download - Erosion & Deposition
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Erosion & DepositionErosion & Deposition
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EROSIONEROSION• Erosion= movement of sediment
by ice, wind, water, or gravity
• Is erosion constructive, destructive, or both? Why?
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CAUSES of EROSION CAUSES of EROSION
Ice (Glaciers) – Glaciers carry
materials along as they move forward
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ICE EROSION EFFECTSICE EROSION EFFECTS
ICEa. “U” shaped Valleyb. Flat Plains
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CAUSES of EROSIONCAUSES of EROSIONWIND carries (blows) sediments
and soil from one place to another
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WIND EROSION EFFECTSWIND EROSION EFFECTSWIND
a.Reshaped surfaces b.Sand storms
c.Dust storms
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EROSION EFFECTSEROSION EFFECTS
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CAUSES of CAUSES of EROSION 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 EFFECTSWATER EROSION EFFECTSKARST 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 WATER EROSION EFFECTSEFFECTS
caves
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WATER EROSION EFFECTSWATER EROSION EFFECTSCaves 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 EFFECTSWATER EROSION EFFECTS
sinkholes
Sinkholes form when the rock underneath the soil, is eroded away & the and above sinks because it is no longer supported
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WATER EROSION EFFECTSWATER EROSION EFFECTSRiver valleys & canyonsare formed when fast moving rivers erode the land over long periods of time.
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EROSION EFFECTSEROSION 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 EROSIONCAUSES 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 EFFECTSGRAVITY EROSION EFFECTS
Mudflows
Landslides
Mass Movement
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DEFINITIONSDEFINITIONSDeposition
Brainstorm:
1) What is it?
2) How can deposition change the surface of the Earth?
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DepositionDeposition• 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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DepositionDeposition• Deposition is constructive because it
builds up Earth’s surface
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DEPOSITION DEPOSITION NONLIVING CAUSESNONLIVING CAUSES
ICE Glaciers deposit sediments as they begin to melt (recede)
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DEPOSITION EFFECTSDEPOSITION EFFECTSICE
-moraines-lakes-hills
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FORCES OFFORCES OFEROSION & DEPOSITIONEROSION & DEPOSITION
WIND When the wind slows down, the sediments are deposited–The heaviestsediments are dropped first
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Deposition EffectsDeposition Effects
• Wind– Sand dunes
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DEPOSITION DEPOSITION NONLIVING CAUSESNONLIVING 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 EFFECTSDEPOSITION EFFECTSWATER
deltasandbarbeac
h
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DEPOSITION EFFECTSDEPOSITION EFFECTSFLOODPLAINS
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DEPOSITION EFFECTSDEPOSITION EFFECTS
stalagmites, & stalactites (ground) (ceiling)
WATER
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Constructive and Destructive Constructive and Destructive Forces ReviewForces Review
• Destructive– Forces that tear
down/wear away Earth’s surface
– Examples:• Weathering • Erosion
• Constructive– Forces that build
up Earth’s surface
– Example:• Deposition
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DEFINITIONSDEFINITIONSErosion
Brainstorm:
1) What is it?
2) What can cause it?
3) How does erosion change the surface of the Earth?
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Possible Types:
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– Erosion wears down Earth’s surface
gullyErosion is a destructive force.
river valley
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