erosion & deposition
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Erosion & DepositionErosion & Deposition
EROSIONEROSION• Erosion= movement of sediment
by ice, wind, water, or gravity
• Is erosion constructive, destructive, or both? Why?
CAUSES of EROSION CAUSES of EROSION
Ice (Glaciers) – Glaciers carry
materials along as they move forward
ICE EROSION EFFECTSICE EROSION EFFECTS
ICEa. “U” shaped Valleyb. Flat Plains
CAUSES of EROSIONCAUSES of EROSIONWIND carries (blows) sediments
and soil from one place to another
WIND EROSION EFFECTSWIND EROSION EFFECTSWIND
a.Reshaped surfaces b.Sand storms
c.Dust storms
EROSION EFFECTSEROSION EFFECTS
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
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.
WATER EROSION WATER EROSION EFFECTSEFFECTS
caves
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.
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
WATER EROSION EFFECTSWATER EROSION EFFECTSRiver valleys & canyonsare formed when fast moving rivers erode the land over long periods of time.
EROSION EFFECTSEROSION EFFECTS
Floodplains are formed over time when a river or stream overflows its regular banks and erodes the land around it.
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
GRAVITY EROSION EFFECTSGRAVITY EROSION EFFECTS
Mudflows
Landslides
Mass Movement
DEFINITIONSDEFINITIONSDeposition
Brainstorm:
1) What is it?
2) How can deposition change the surface of the Earth?
-
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?
DepositionDeposition• Deposition is constructive because it
builds up Earth’s surface
DEPOSITION DEPOSITION NONLIVING CAUSESNONLIVING CAUSES
ICE Glaciers deposit sediments as they begin to melt (recede)
DEPOSITION EFFECTSDEPOSITION EFFECTSICE
-moraines-lakes-hills
FORCES OFFORCES OFEROSION & DEPOSITIONEROSION & DEPOSITION
WIND When the wind slows down, the sediments are deposited–The heaviestsediments are dropped first
Deposition EffectsDeposition Effects
• Wind– Sand dunes
DEPOSITION DEPOSITION NONLIVING CAUSESNONLIVING CAUSES
WATER-When the water slows down, the heaviest sediments are deposited first
Older rivers have curves called meanders.
• Canarvon Gascoyne Delta Shark Bay W Australia
DEPOSITION EFFECTSDEPOSITION EFFECTSWATER
deltasandbarbeac
h
DEPOSITION EFFECTSDEPOSITION EFFECTSFLOODPLAINS
DEPOSITION EFFECTSDEPOSITION EFFECTS
stalagmites, & stalactites (ground) (ceiling)
WATER
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
DEFINITIONSDEFINITIONSErosion
Brainstorm:
1) What is it?
2) What can cause it?
3) How does erosion change the surface of the Earth?
-
Possible Types:
– Erosion wears down Earth’s surface
gullyErosion is a destructive force.
river valley
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