The Process of Change

Erosion and Its Effects

http://www.geo-images.com/atlas

By 6th Grade Student

Ms. Krieter’s ClassRoom M2

August 9, 2002

http://www.geo-images.com/atlas

Definition of Erosion

• Erosion is the process whereby the soil and the rocky materials of the Earth's crust are loosened, dissolved, or worn away, and then moved from one place to another.

www.cnn.com/2000/NATURE/ 06/27/fema.erosion.02/

http://www.geo-images.com/atlas

Agents of Erosion

• Running Water • Wind • Glaciers • Gravity

Running Water

• Running water can carve out dramatic valleys and canyons.

• The picture shows a V-shaped valley carved by a river.

http://www.geo-images.com/atlas

Running Water

• Running water can carve out dramatic valleys and canyons.

• The picture shows a slot canyon created by extremely fast moving water. This place is very dangerous due to flash floods.

http://www.geo-images.com/atlas

Running Water

• Sediment is picked up by the water and taken to a lower point.

• This process slowly carves out the land.

http://dgl.microsoft.com/

Running Water

• Deltas are formed where the sediment is dropped as the water slows down at the sea.

• The picture shows the Nile Delta in Egypt. This is where the Nile flows into the Mediterranean Sea.

http://www.nasm.si.edu/ceps/rpif/ssp/STS076_719_053.gif

Agents of Erosion

• Running Water • Wind • Glaciers• Gravity

Wind

• Wind picks up small particles and moves them to another place.

• The picture shows sand dunes created by wind erosion.

Wind

• Wind picks up small particles and moves them to another place.

• The video shows a dust storm - erosion in progress.

Agents of Erosion

• Running Water • Wind • Glaciers • Gravity

Glaciers

• Glaciers pick up large sediment and very slowly carve out large U-shaped valleys.

• Yosemite Valley in California was created by a glacier.

Glaciers

• Glaciers pick up large sediment and very slowly carve out large U-shaped valleys.

• Half Dome in Yosemite Valley was sliced in half by a glacier.

Agents of Erosion

• Running Water • Wind • Glaciers • Gravity

Gravity

• Gravity causes materials to go downhill. This movement can be slow or quick.

• The picture shows cleaving; a piece of rock broke off and fell to the ground.

Gravity

Four types of erosion caused by gravity.

Gravity

http://www.uwsp.edu/geo/faculty/ritter/images/lithosphere/mass_wasting_erosion/landslide_La_Conchita_CA_USGS_slide21_small.jpg

Slump

http://www.aqd.nps.gov/grd/parks/tica/tica_virtual_fieldtrip/Stop3.htm

Rockslide

Comprehension Questions1. What is erosion?

2. Give an example of erosion and what caused it.

3. What agent of erosion caused what you see in the picture?

http://www.geo-images.com/atlas

Sourceshttp://www.geo-images.com/erosion.jpg

http://www.geo-images.com/atlas

http://www.school.discovery.com/clipart/

http://www.nasm.si.edu/ceps/rpif/ssp/STS076_719_053.gif

http://dgl.microsoft.com/

http://www.uwsp.edu/geo/faculty/ritter/images/lithosphere/mass_wasting_erosion/landslide_La_Conchita_CA_USGS_slide21_small.jpg

http://www.aqd.nps.gov/grd/parks/tica/tica_virtual_fieldtrip/Stop3.htm

www.cnn.com/2000/NATURE/ 06/27/fema.erosion.02/