Erosion and Deposition 6 th Grade Earth Science October 2012

Who is a 1 and who is a 2? Turn to your partner and share with them the following: What is your favorite book and why? If you are closest to my favorite book you are a 1, etc. My favorite book is …

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 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 quickly a.Slump – rock & soil suddenly fall, big mass 2. Creep – slow, down movement of rock/ soil. 3. Mudflow - mud 4. Avalanche - snow

What type of mass movement is each picture? LANDSLIDEMUDFLOW SLUMP CREEP

Ice Ice (glaciers) carry sediment.

Ice Erosion Continental Glaciers – covers continent. Flattens / smoothes land Kettle Lakes Alpine Glacier – in the mountains. Land made rugged. Horns – sharp pyramid shaped peaks U-Shaped Valleys

Ice Deposition Tills – unsorted, deposited rock material Moraines – ridges along edge of glacier Stratified Drift – layers of rock deposited based on size Outwash plain – large area of drift

Which type of glacier or landform is represented in each picture? Continental GlacierAlpine Glacier KettleU Shaped Valley

What did glaciers create in each picture? Outwash Plain Southeast, Alaska Moraine Thompson Glacier, Canadian Arctic 1 2

Wind Wind blows sediment after it is weathered.

Wind Deposition Sand Dunes – mounds of wind deposited sand. Move in direction of wind. Loess – thick deposits of fine-grained, wind blown sediment

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

Water Erosion Sea Cliffs – rock wears away Sea Caves – hole in rock created by waves near cliff Sea Arches – waves cut hole completely through rock in a sea cave Sea Stacks – offshore column of rock once connected to the mainland

What did water erosion create in each of these pictures? SEA CAVE SEA STACKS SEA ARCH SEA CLIFFS

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 Beaches – deposited sand

What did water create in each of these pictures? DELTA SANDBAR ALLUVIAL FAN portal.co.uk/GroupDownloadFile.asp?file= BEACH