Transcript weathering

JOURNAL ENTRY 1/28/2013
• What would be the result to a
topographical map after a forest fire?
• What would be the result to a
topographical map after a landslide?
• Is all erosion bad for the earth?
WEATHERING
The process of rock
breaking down into
smaller pieces
AGENTS OF WEATHERING
• PHYSICAL AGENTS
– (Physical Changes)
•
•
•
•
•
Glaciers
Animals
Ice
Ocean Waves
Plant Roots
Animal Actions
Ice Wedging
CHEMICAL AGENTS
OF WEATHERING
• Plant Acids
• Acid Rain
• Oxidation
• (CHEMICAL CHANGES)
Acid Rain
EROSION
Process of
weathered rocks
being carried away
AGENTS OF EROSION
• Main force: gravity
• Sediments removed & carried by glaciers,
wind, water, and gravity (agents)
• Moving glaciers smooth and polish rock
below
• Wind moves loose sand, silt & clay
• Moving sand sandblasts a surface
• Most important agent of erosion is running
water
• Particles carried by stream called the load
LANDSLIDE (due to gravity)
DEPOSITION
Process of
sediments
settling in a new
location
MISSISSIPPI RIVER DELTA
Colorado River Alluvial Fan
Erosion
The first five pictures of this presentation are of the same rock, just
in different time periods. Pay attention to the dates on the side of
the pictures and see what the water did to this rock.
1890
Erosion
Still the same rock.
1910
Erosion
Still the same rock.
1920
Erosion
Still the same rock.
1970
Erosion
Still the same rock, but where did it go?
1990
Here is another picture of what erosion caused.
Why are the roots of this tree so visible? What made this happen?
The ground has been washed away by water. That is erosion.
Erosion can be caused by water.
Erosion can be caused by wind and
rain.
Erosion can happen quickly or slowly over a period
of time. This formation took years and years of
erosion to form.
These pictures
are of erosion
down mountains
that destroyed
the houses at the
bottom.