waves, wind, and glaciers erosion and deposition
TRANSCRIPT
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WAVES, WIND, AND GLACIERS
Erosion and Deposition
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How Waves Form
The energy in waves from wind that blows across the water’s surface.
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Erosion by Waves
Waves shape the coast through erosion by breaking down rock and transporting sand and other sediment.
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How Waves Erode Land
Impact Abrasion Change in Wave Direction
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Headland
Part of the shore that sticks out into the ocean. Example: Marin Headland
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Erosional Features of Waves
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Depostional Features of Waves
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Wave Erosion & Deposition Landforms
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Erosion by Wind
Wind causes erosion by deflation and abrasion.
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Deflation
The erosion of sediment by wind. Stronger the wind, the larger the
particles it can pick up.
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Deposits By Wind
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Glacier
Any large mass of ice that moves slowly over land.
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Plucking
The process by which a glacier picks up rocks as it flows over the land.
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Till
A mass of rock and soil deposited directly by a glacier.
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Two Kinds of Glaciers
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Continental Glacier
A glacier that covers much of a continent or large island.
Can cover millions of square kilometers. Antarctica and Greenland. Can flow in all directions. Can spread out like pancake butter in a
frying pan.
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Ice Ages
In the past, continental glaciers have covered larger parts of the Earth’s surface.
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Valley Glaciers
A long, narrow glacier that forms when snow and ice build up high in a mountain valley.
The sides of mountains keep these glaciers from spreading out in all directions.
Found in many high mountains. Sierra Nevada and Mount Shasta.
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Glaciers
Glaciers can form only in an area where more snow falls than melts.
Once the depth of snow and ice reaches more than 30 to 40 meters, gravity begins to pull the glacier downhill.
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How Glaciers Shape the Land
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Plucking and Abrasion
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Glacial Deposition
When a glacier melts, it deposits the sediment it eroded from the land, creating various landforms.
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Glacial Deposition Landforms
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Glacial Landforms
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Credits
Geo Resources http://www.google.com/imgres?hl=en&biw=1169&bih=663&tbm=isch&tbnid=NEojdsvuGCLF8M:&imgrefurl=http://www.georesources.co.uk/
leld.htm&docid=IGXmJeec1Qr11M&imgurl=http://www.georesources.co.uk/sea6.gif&w=380&h=292&ei=P_5nT_2FI6yMigLawKmgBw&zoom=1&iact=hc&vpx=480&vpy=226&dur=1544&hovh=197&hovw=256&tx=159&ty=83&sig=102853300329707996231&page=2&tbnh=145&tbnw=189&start=15&ndsp=20&ved=1t:429,r:7,s:15
Association of Environmental & Engineering Geologists. Retrieved on 3/19/2012. http://www.google.com/imgres?hl=en&biw=1169&bih=663&tbm=isch&tbnid=xXW6jQgEKQBf_M:&imgrefurl=http://www.aegweb.org/
i4a/pages/index.cfm%3Fpageid%3D4083&docid=EmzY2eWlU_R95M&imgurl=http://www.aegweb.org/images/Geologic%252520Hazards/erodedbeach.gif&w=400&h=280&ei=P_5nT_2FI6yMigLawKmgBw&zoom=1&iact=hc&vpx=491&vpy=157&dur=3908&hovh=188&hovw=268&tx=171&ty=55&sig=102853300329707996231&page=1&tbnh=134&tbnw=191&start=0&ndsp=15&ved=1t:429,r:2,s: