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Title of Notes: Erosion & Deposition pg. 29, 30, & 31 RS
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Erosion video
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EROSION Erosion= movement of sediment by ice, wind, or water
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Erosion is a destructive force.
Erosion wears down Earth’s 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 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
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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Deposition video
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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
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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 OF EROSION & 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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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
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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Notebook activity Draw a picture to represent wind, water, and ice erosion effects. Label each. Draw a picture to represent wind, water, and ice deposition effects. Label each
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