Erosion and Deposition What is Erosion Erosion is

Erosion and Deposition

What is Erosion? Erosion is the movement of sediment by wind, ice, water, or gravity.

What is Deposition? The dropping of sediment out of the wind, water, ice, or gravity and settling in a new place.

Wind Erosion Wind blows sediment after it is weathered.

Wind Deposition ¢ Sand Dunes – mounds of wind deposited sand. Move in direction of wind.

Wind Deposition ¢ Loess – very fertile sediments of Quartz, Feldspar, Mica, and clay deposited by the wind

Water Erosion Water (rivers, oceans, rain, etc. ) washes sediment after being weathered

Water Deposition ¢ Deltas – slow river current drops sediment in fan-shaped pattern at end of river ¢ Sand Bars – offshore deposit of sand, gravel, or shell material ¢ Alluvial Fans – fan-shaped mass of material deposited by a stream with a steep incline ¢ Beaches – deposited sand

http: //www. schoolportal. co. uk/Group. Download. File. asp? file=21604 1 1 4 5 3 2 DELTA 2 SANDBAR 44 BEACH 6 ALLUVIAL FAN What did water create in each of these pictures?

Ice Erosion Ice (glaciers) carry sediment.

Ice Deposition Tills – unsorted, deposited rock material

Ice Deposition Stratified Drift – layers of rock deposited based on size

Gravity Erosion Sediment falls

Gravity Erosion Angle of Repose is the steepest angle, or slope at which a material will not slide down.

Gravity Deposition Mass Movement gravity moves material down a slope 1. Landslide - rock & soil move quickly 2. Creep – slow, down movement of rock/ soil. 3. Mudflow – mud 4. Avalanche - snow

LANDSLIDE MUDFLOW 2 1 What type of mass movement is each picture? http: //classes. colgate. edu/dkeller/geol 101/massw/mass. htm CREEP SLUMP 3 4

Erosion and Deposition Exit Ticket 1. List one agent / cause of Erosion and one way it changes the Earth. 2. List a second agent / cause of erosion and one way it changes the Earth.