Erosion & Deposition. DEFINITIONS Erosion Brainstorm: 1) What is it? 2) What can cause it? 3) How...
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Transcript of Erosion & Deposition. DEFINITIONS Erosion Brainstorm: 1) What is it? 2) What can cause it? 3) How...
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:
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
CAUSES of EROSIONCAUSES of EROSION
WIND carries
(blows) sediments and soil from one place to another
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 EFFECTSWATER EROSION EFFECTS
Caves 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
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?
DEPOSITION DEPOSITION NONLIVING CAUSESNONLIVING CAUSES
ICE Glaciers deposit sediments as they begin to melt (recede)
FORCES OFFORCES OFEROSION & DEPOSITIONEROSION & DEPOSITION
WIND
When the wind slows down, the sediments are deposited–The heaviestsediments are dropped first
DEPOSITION DEPOSITION NONLIVING CAUSESNONLIVING CAUSES
WATER-When the water slows down, the heaviest sediments are deposited first
Older rivers have curves called meanders.