Erosion and Deposition 6th Grade Earth Science October 2016

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

Gravity Erosion Sediment falls

Angle of Repose is the steepest angle a material will not slide down. Gravity Erosion Angle of Repose is the steepest angle a material will not slide down.

gravity moves material down a slope Gravity Deposition Mass Movement gravity moves material down a slope Landslide - rock & soil move quickly Creep – slow landslide Slump – block of land slides downhill Mudflow – mud Avalanche – snow https://www.youtube.com/watch?v=B0RWLxOFGLY

What type of mass movement is each picture? LANDSLIDE MUDFLOW 2 1 What type of mass movement is each picture? http://classes.colgate.edu/dkeller/geol101/massw/mass.htm CREEP SLUMP 4 3

Ice (glaciers) carry sediment. Ice Erosion Ice (glaciers) carry sediment.

Ice Deposition Tills – unsorted, deposited rock material

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

Wind blows sediment after it is weathered. Wind Erosion Wind blows sediment after it is weathered.

Wind Deposition Sand Dunes – mounds of wind-deposited sand. Moves in the direction of the 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 away 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

What did water create in each of these pictures? http://www.school-portal.co.uk/GroupDownloadFile.asp?file=21604 5 2 3 1 2 SANDBAR DELTA BEACH 1 4 4 6 4 ALLUVIAL FAN What did water create in each of these pictures?

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