Erosion New
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Transcript of Erosion New
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EROSION:•TRANSPORT OF SEDIMENTS
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AND DEPOSITIN
G THEM
ELSEWHERE
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EROSION IS DRIVEN BY THE FORCE OF
EROSION IS DRIVEN BY THE FORCE OF
GRAVITY
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THE AGENTS OF EROSION ARE:
RUNNING WATERWINDMOVING ICE (GLACIERS)
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Each Agent of Erosion Produces
it’s Own Characteristic
shape and Texture in the
Sediment :
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ROUNDS ANDSMOOTHESTHE ROCK SURFACEALSO MAKES ITSMALLER
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WIND BLOWN SEDIMENTSFROST AND PIT THE ROCKSURFACE
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SMALL SEDIMENTS IN THE GLACIER POLISHES & SMOOTHES THE ROCK SURFACE
LARGE SEDIMENTS SCRATCH AND STRIATE THE ROCK SURFACE
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FALLEN ROCKS ARESHARP &ANGULAR
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RUNNING WATER
The primary agent of erosion is:
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Colorado River
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Grand Canyon
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Niagra Falls
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EROSION BY WATER:
PARTICLES ARE CARRIED IN SEVERAL WAYS DEPENDING ON THEIR
SIZE
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THREE ways
streams transport sediment:
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SEDIMENTS IN SOLUTION:
DISSOLVED IONS
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examples :
•Salt•calcite
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Dissolved ions in solution
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SEDIMENTS IN SUSPENSION:
COLLOIDS
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Can you think of examples :
•SILT•CLAY
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SEDIMENTS ROLLED AND
BOUNCED: LARGE SEDIMENTS dragged along the bottom
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VELOCITY OF A STREAM
DEPENDS ON:SLOPE (GRADIENT) AND
DISCHARGE•volume of water
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Water movesfaster on the
outside ofa bendEROSION
Water movesslower on the
inside ofa bendDEPOSITION
LABEL YOUR DIAGRAM
(EROSION) & (DEPOSITION)
EROSION
DEPOSITION
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Erosion occurs
at points
Depsosition occurs
at points
B & E
A & F
A B
C
D
FE
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B
C D
E F
Maximum erosion
occurs where there
is maximum
_____________
On a straight path
the maximum velocity is in the ___________
below the ____________
centersurface
velocity
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EROSION OCCURS AT THE OUTSIDE
DEPOSITION OCCURS AT THE INSIDE
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THE MOVEMENTOF THE WATERCAN EVENTUALLYFORM ANOXBOW LAKE
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SEDIMENTS LEFT BEHIND BY
STREAMS AND WIND ARE ________ SORTED
dropped off in size order
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CALCULATE THE MINIMUM VELOCITY
OF A STREAM NEEDED TO CARRY
A PEBBLE:
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(SEE REF. TABLE PAGE 6)
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APPROXIMATELY 50 CM/SEC
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WHAT IS THE MINIMUM VELOCITY NEEDED TO CARRY A BOULDER? 200 CM/SEC
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SORTING
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WIND:
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EROSION BY WIND OCCURS PRIMARILY
IN:
•DRY CLIMATES
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The particles transported (eroded) by
wind are_________Sorted
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Severe draughts in the mid-west during the 1920’s and 30’s caused this area to be known as the “Dust bowl”
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Glacial Erosion:•When more snow in winter accumulates than _______ in the summer the snow at the bottom turns to _________.
meltsice
gravity
advance
•If it becomes thick enough, it’s weight will cause it to move under the pull of___________.
•This is called a glacial _________
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1.Glaciers create U- shaped valleys
Characteristics of Glacial Erosion:
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escarpment
U-shaped valley
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Advancing glacier
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Retreating glacier
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Long Island Sound
South Shore
North Shore
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2. Sediments left behind by glaciers are
STRIATIONS SHOW THE DIRECTION OF MOVEMENT OF THE GLACIER
polished& striated (scratched)
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3. SEDIMENTS LEFT BEHIND BY
GLACIERS ARE:
UNSORTED
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Advancing glacier
MORE SNOW FALLS THAN MELTS
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Retreating glacierICE BEGINS TOMELTDUE TO CLIMATE CHANGE
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Terminal end of advancing glacier
Latest advance
Melt-water carrying sortedSediment toward the ocean
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THE SOUTH SHORE OF LONG ISLAND
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F
FOUND ON THE NORTH SHOREOF LONG ISLAND
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FASTEST VELOCITYIS AT THE CENTEROF THE VALLEY
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Some glacial features include:
escarpment
U-shaped valley
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drumlins
outwash plain
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• Some Glacial Features include:• U-shaped valleys
• Moraines: unsorted sediments
• Drumlins: elongated moraines
• kettle lakes: round glacial lake
• finger lakes: elongated glacial lake
• outwash plains: deposited by melt-water streams
• Erratic: large rock
deposited by a glacier
• Escarpment: steep cliff
• Horn: sharp peakDrumlins
outwash plain
Kettle lakes
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River erosion: notice the V-shaped valleys and meanders (bending)
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Valley glacier eroding a U-shape
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Glacial features left behind
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Glaciers / Rivers
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A B
C
A B
C
Match the cross sectionsbelow with the lines onthe stream
A B C