1. Erosion of Earth’s Surface SWBAT identify agents of erosion; describe the effects of erosion

2. Agents of Erosion Erosion – the wearing away and removal of rock or sediment. List the 4 main agents of erosion. –Gravity –Ice –Water –Wind

3. Gravity Mass movement –when gravity alone causes rock or sediment to move down a slope. What is the main force that causes all of these mass movements to happen? –Gravity

4. Mass Movements Creep –The process in which sediments move slowly downhill. –This is common were freezing and thawing occur

5. Mass Movements Slump –Occurs when a mass of rock or sediment moves downhill, leaving a curved scar. –These are most common thick layers of loose sediment.

6. Mass Movements Rock slides –Layers of rock break loose from slopes and slide to the bottom. –They can reach speeds higher than 250 km/h. –Most commonly occur in mountainous areas.

7. Mass Movements Mudflows –A mass of wet sediment flows downhill over the ground surface. –Happens where heavy rains or melting snow and ice saturate sediments. –Can reach speeds of 160 km/h.

8. Ice What are the two types of glaciers? –Valley glacier Glaciers that form in valleys in high, mountainous areas –Continental glacier Glaciers that cover broad continent-sized areas How do glaciers erode rock? –Ice can pull pieces of cracked rock out and carry it along, scratching earth’s surface as it moves, creating grooves or striations.

9. Wind Deflation –when wind blows across loose sediment like silt and sand, it lifts and carries it. Abrasion –makes pits in rocks and produces smooth, polished surfaces. Both deflation and abrasion are caused by what eroding agent? –Wind

10. Water Runoff –water that flows over Earth’s surface. What are some landforms that can be created from erosion? –Canyons –Valleys –Hills –Sandbars –Deltas

11. Get your lab notebook Title: Can evidence of sheet erosion be seen in a farm field? With a partner read the applying science box on page 329. Complete number 1-3 under solving the problem in your lab notebooks.

12. With a partner Answer questions 1-5 on page 331. Be sure to answer in complete sentences, restating the question. Finish for homework