Transcript Weathering and Erosion ppt

Weathering, Erosion, and
Deposition
Weathering
Weathering
Process of breaking down rocks and
other substances on the earth by
heat, cold, water, or ice
Erosion
Erosion
The process by which water, ice,
wind, and gravity move rock and soil
Slow Erosion
Quick Erosion
Erosion
Deposition
Occurs where the sediment
produced by weathering and
erosion is moved somewhere else
and changes the shape of the land
Weathering, erosion, and deposition act together
in a cycle that wears down and builds up Earth’s
surfaces.
How would this effect a
topographic map?
How would
this effect a
topo map?
Glacier Movement: Glaciers grow
and shrink depending on rain,
temperature, and other factors.
As they grow they carry sediment
When they shrink, they leave the
sediment
Erosion
How would
this effect a
topo map?
Rivers: Rivers gradually remove rocks and
dirt from river banks which reshapes the
river and causes them to erode
Causes: v-shaped valleys, waterfalls, and
other river features
How could scientists use
topographic maps or satellite
images to see erosion?
Yellow River Delta
• What happening in the pictures?
Yellow River Delta
• When a new dam is built, the river
changes direction and begins building the
delta by dumping sediment on the
northeast side of the peninsula. A second
change in the course of the river occurs
and the delta begins to build out by
increased deposition in a new location
slightly to the west. Also, the original
peninsula has decreased in length toward
the southeast.
Mountaintop Mining, West Virginia
• What’s happening in this picture?
Mountaintop Mining, West Virginia
• The mining operations are reducing the
elevation of an ever increasing area by
removing the top elevations of the
mountains. They may also note that a new
lake is formed as a result of the mining
operations.
Water Level in Lake Powell
• What’s happening in these pictures?
Water Level in Lake Powell
• The water level changes from year to year,
which in some years, causes some
streams not to drain into Lake Powell and
at times exposes the river bed, as well as
the bottom of the lake. The series ends
with a rise in the water level.