statuegrand canyon sand pile what do these 3 things have in common??
TRANSCRIPT
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statue Grand Canyon
Sand Pile
What doThese 3 Things Have in
Common??
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They have all been
subjected to the
process of
WEATHERING
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WEATHERING: isTHE CHEMICAL AND PHYSICALPROCESS THAT
CHANGES ROCK
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For weathering to occur the rocks must
be exposed to:
WATER (hydrosphere)AIR (atmosphere)
ACTION OF HUMANS & OTHER LIVING ORGANISMS
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Evidence of Weathering:
the end product of theweathering of rock is
SEDIMENT
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PHYSICAL WEATHERING:
ROCKS ARE BROKEN INTO SMALLER PIECES WITHOUT CHANGING THE
CHEMICAL NATURE OF THE ROCK
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Explain how water and wind
can can causephysical
weathering in the
following ways:
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The alternate freezing
andthawing of
water
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WATER EXPANDSWHEN IT FREEZES
This is called…….
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Ice Wedging or Frost Action
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a weathered sidewalk
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*ABRASION
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RUNNING WATER AND WIND CAN RUB OR WEAR DOWN ROCKS
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* BIOLOGIC ACTIVITY
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A sidewalk being lifted by the tree roots!!
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*Humans can influence the rate of weathering by
theuse of powerful
equipment
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If you increase the surface area
you will ___________ the rate of weathering
increase
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Surface area
rateof
weathering
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CHEMICAL WEATHERING:
Rocks are broken and the chemical composition is also ___________CHANGED
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•OXIDATION OCCURS WHEN __________ FROM AIR COMBINES WITH ___________ TO FORM OXIDES
OXYGEN
MINERALS
RUST
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•CARBONATION
OCCURS WHEN __________ CONTAINING
__________ ACID
DISSOLVES MINERALS
WATER
CARBONIC
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EX.
LIMESTONE CAVES
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* POLLUTANTScan speed up
the rate ofchemical weathering
OXIDES OF SULFER AND NITROGEN MAKE RAINWATER UNNATURALLY ACIDIC
ACID RAIN
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•HYDRATIONOCCURS WHEN _______ SUCH AS MICA AND FELDSPAR ABSORB ________ AND WEAKEN AND FORM ________
MINERALS
WATERCLAY
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CLIMATIC EFFECTS ON WEATHERING:
PHYSICAL WEATHERING DOMINATES IN
COLD,MOIST
CLIMATES
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CLIMATIC EFFECTS ON WEATHERING:
CHEMICAL WEATHERING DOMINATES IN
WARM, MOIST
CLIMATES
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IN GENERAL WHEN THERE IS MORE
THERE IS MOREWEATHERING
MOISTURE
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CLEOPATRA’S NEEDLECentral
Park
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RATE OF WEATHERING ALSO
DEPENDS ON:
MINERAL COMPOSITION
ROCK RESISTANCE(HARDNESS)
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SHALE
SANDSTONE
SHALE
SANDSTONELIMESTONE
SHALE
DOLOSTONE WHICH ROCK IS THE MOST
RESISTANT TO
WEATHERING?
WATER
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SHALE
SANDSTONE
SHALE
SANDSTONELIMESTONE
SHALE
DOLOSTONE WHICH ROCK IS THE MOST
RESISTANT TO
WEATHERING?
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SHALE
SANDSTONE
SHALE
SANDSTONELIMESTONE
SHALE
WHICH ROCK IS THE LEAST
RESISTANT TO
WEATHERING?
DOLOSTONE
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SHALE
SANDSTONE
SHALE
SANDSTONELIMESTONE
SHALE
WHICH ROCK IS THE LEAST
RESISTANT TO
WEATHERING?
DOLOSTONE
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SOIL FORMATION:SOIL IS THE
COMBINATION OF:
ROCK PARTICLESMINERALSORGANIC MATTER
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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 AND
SMOOTHESTHE ROCK SURFACE
ALSO MAKES ITSMALLER
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WIND BLOWN SEDIMENTS
FROST 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