EROSION AND DEPOSITION - earthtoleigh.comearthtoleigh.com/earth/documents/keynotes/surface...EROSION...
Transcript of EROSION AND DEPOSITION - earthtoleigh.comearthtoleigh.com/earth/documents/keynotes/surface...EROSION...
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EROSION AND DEPOSITIONHow are sediments moved and placed in a new location?
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After rocks are broken up from weathering they need to be moved
Erosion - process where particles are transported as sediment
Over time erosion helps shape and lower all surface features
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Agents of Erosion - forces that are set in motion by gravity that causes sediments to move
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Examples of Agents of Erosion:
•Waves
•Glaciers
•Wind
•Streams
•Mass Movement
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Streams
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Waves
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Glaciers
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Wind
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Mass Movement
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Gravity --- Direct Role
Force behind most agents of erosion
Causes rivers to flow, ice to move, and rocks to slide
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The Sun --- Indirect Role
Drives the water cycle which produced rain and ice
Fuels winds and drives ocean currents
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Deposition - the process by which sediments are released from an erosional system
Sediments are deposited in locations where they form layers of sedimentary rock
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The sediments determine how fast they are deposited:
Size - larger sediments will settle faster
Shape - rounder sediments settle faster and flatter sediment will take longer
Density - more dense sediment will settle faster
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Sorted Sediment - layers of sediment that are similar in size, shape or density
Example: deposition from a stream
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Unsorted Sediment - layers of sediment that are mixed in size, shape or density
Example: deposition from a glacier
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Horizontal Sorting - when the velocity of a wind or water erosional system gradually decreases; the size, roundness, and density gradually decrease as you move farther out
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Vertical Sorting - larger or more dense sediments settle to the bottom first, followed by decreasing size and density
Example: as a stream slows down throughout the year it can no longer transport larger material and begins to deposit the sediments according to size order
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Vertical Sorting -
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Vertical Sorting
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