EROSION IS Process that moves weathered sediments from one
location to another Sediments are either weathered chemically or
mechanically The four agents of erosion are: Wind Water Gravity
Glacier
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COMMON CHARAC TERISTICS Carry sediments when they have energy
of motion Drop their load of sediments when energy of motion
decreases Deposition is the dropping of sediments
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GRAVITY Mass movement is when materials move down slope Can be
very fast or very slow
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SLUMP Slump takes place on steep slopes when material slips
downward as one large mass leaving a curved scar Occurs when the
material under weakens
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CREEP Very slow movement Common in areas of freezing and
thawing since as the ground freezes, small sediments are pushed
upwards Usually seen with fences and utility poles
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ROCKSLIDE Happens when large blocks break loose from steep
slopes and tumble quickly to the bottom
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MUDFLOWS/MUDSLIDES Usually occur in relatively dry areas where
weathering had formed thick layers of sediments With a heavy rain
the water adds mass and makes the sediments slippery Occurs on
steep slopes mudslide
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WATER Erodes more sediments than any other agent The more
energy of movement the more is eroded When the water loses energy
the sediments are dropped Alluvial fan is shaped like a triangle
and is deposited in rivers Delta is deposited when it empties into
an ocean, gulf or lake
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WATER DEPOSITION ALLUVIAL FAN
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DELTA
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RILL AND GULLY EROSION Begins when a small stream forms during
a heavy rain. Carries away plants and soil If it happens frequently
it will evolve into a gully Gully erosion, the channel is deeper
and broader
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RILL EROSION
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GULLY EROSION
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SHEET EROSION Happens when rainwater flows over a fairly flat
area or gentle slope When the water loses its energy of motion, the
sediments cover the land like a sheet
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LAND PRONE TO EROSION
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STEEP SLOPES When you build you destroy the vegetation which
helps to keep soil in place Not much to anchor your house to
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SOLUTIONS
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TERRACES
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GLACIERS It is a moving mass of ice and snow Two types are
continental and valley Continental cover about 10% of the surface
and are found at polar regions Valley glaciers are located in
mountainous regions Move slowly and act as a bulldozer Plucking is
when they pick up rocks and scrape the surface of what they move
over
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CONTINENTAL
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VALLEY
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U-SHAPED VALLEY
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GLACIAL GROOVES
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TILL Deposited when it loses energy of motion
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MORAINE
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OUTWASH
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WIND *common in deserts, beaches and plowed fields *deflation
when wind picks up fine sand and leaves behind pebbles
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ABRASION is similar to sandblasting
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LOESS IS A LARGE DEPOSIT OF FINE SAND DUNES ARE THE MOST COMMON
FORMED WHEN SAND PILES UP DUE TO AN OBSTACLE CONSTANTLY
CHANGING
