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What is Erosion?
Erosion is the movement of sediment by wind, ice
(glaciers), water, or gravity.
What is Deposition?
The dropping of sediment out of the wind, water, ice (glaciers), or
gravity and settling in a new place.
Creates new landforms.
Wind Deposition Loess – very fertile sediments of Quartz,
Feldspar, Mica, and clay deposited by the wind
Water Erosion
Moving Water (rivers, oceans, rain, etc.) carries tons of sediment as it
moves.
Water is the main agent of erosion.
Water Deposition Floodplain- an area along a river that forms from sediments
deposited when the river overflows its bank (freshwater) Deltas – a fan-shaped mass of material deposited at the
mouth of a river or the ocean (freshwater) Alluvial Fans – fan-shaped mass of material deposited by a
stream with a steep incline occurs on land (freshwater) Sand Bars – offshore deposit of sand, gravel, or shell
material (oceans) Barrier Island- is a long narrow island forms along the
coast- protects coastal regions from waves and storms (ocean waves)
Beaches – deposited sand (ocean waves)
What did water create in each of these pictures?
DELTA SANDBAR
ALLUVIAL FAN
http://www.school-portal.co.uk/GroupDownloadFile.asp?file=21604
1
2
4 4 6
1 2
4
53
BEACH
5.Barrier Island 6. Flood Plain
Glacial DepositionTill – unsorted, deposited rock material
Gravity ErosionSediments fall (sediments move
down slope due to the force of Gravity)
The Steeper the slope the faster the sediment move down slope
Gravity ErosionAngle of Repose is the steepest angle, or
slope at which a material will not slide down.
Gravity DepositionMass Movement
gravity is a force that moves material down a slope
1. Landslide - rock & soil move quickly down a slope (slump most common type of landslide)
2. Rock Slide/Fall- Rocks moving quickly down slope
3. Creep – slow, downhill movement of rock/ soil.
4. Mudflow – mud flows down a slope during heavy rains- happens quickly
5. Avalanche – snow moves quickly down a slope
What type of mass movement is each picture?http://classes.colgate.edu/dkeller/geol101/massw/mass.htm
LANDSLIDE MUDFLOW
SLUMP CREEP
1 2
3 4