Transcript the_process_of_change

The Process of Change
Erosion and Its Effects
http://www.geo-images.com/atlas
By 6th Grade Student
Ms. Krieter’s Class
Room 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 Vshaped 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
Slump
Rockslide
http://www.aqd.nps.gov/grd/parks/tica/tica_virtual_fieldtrip/
Stop3.htm
http://www.uwsp.edu/geo/faculty/ritter/images/lithosphere/mass_was
ting_erosion/landslide_La_Conchita_CA_USGS_slide21_small.jpg
Comprehension Questions
1. 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
Sources
http://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_US
GS_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/