1. External Forces that Shape the Earth

2. Erosion Occurs when weathered material is moved by the action of wind, water, ice, or gravity There are several different kinds of erosion…

3. Water Erosion Occurs as water flows in a stream or river and picks up loose material, moving it downstream. Another type of water erosion is abrasion, which is the grinding away of rock by transported particles.

4. Wind Erosion Similar to water erosion in that the wind transports and deposits sediment in other locations. Winds must reach at least 11 miles per house before it can move sediment. Did you Know? A dust storm is capable of carrying 6,000 tons of sediment per cubic mile of air!

5. Glacial Erosion/Glaciation Occurs by slowly moving glaciers Massive glaciers cut U- shaped valleys into the land When glaciers melt, they also leave behind rocks that were carried on top of the glacier