Weathering For Sci 8
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Weathering For Sci 8

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Weathering For Sci 8 Weathering For Sci 8 Presentation Transcript

  • statue Grand Canyon Sand Pile What do These 3 Things Have in Common??
  • They have all been subjected to the process of WEATHERING
  • weathering
  • WEATHERING : is
    • THE CHEMICAL
    • AND PHYSICAL
    • PROCESS THAT
    • CHANGES ROCK
  • For weathering to occur the rocks must be exposed to: WATER (hydrosphere) AIR (atmosphere) ACTION OF HUMANS & OTHER LIVING ORGANISMS
  • Evidence of Weathering: the end product of the weathering of rock is SEDIMENT
  • PHYSICAL WEATHERING:
    • ROCKS ARE BROKEN INTO SMALLER PIECES WITHOUT CHANGING THE
    CHEMICAL NATURE OF THE ROCK
  • Explain how water and wind can can cause physical weathering in the following ways:
  • The alternate freezing and thawing of water
  • WATER EXPANDS WHEN IT FREEZES This is called…….
  • Ice Wedging or Frost Action
  • a weathered sidewalk
  • Half Dome in Yosemite California
  • *ABRASION
    • RUNNING WATER AND WIND CAN RUB OR WEAR DOWN ROCKS
  •  
  • RUNNING WATER AND WIND CAN CAUSE ROCKS TO RUB AGAINST EACH OTHER AND WEAR THEM DOWN
  • * BIOLOGIC ACTIVITY
  • A sidewalk being lifted by the tree roots!!
  •  
  • PLANT ROOTS EXPOSES NEW SURFACES TO WEATHERING
  • *Humans can influence the rate of weathering by the use of powerful equipment
  • If you increase the surface area you will ___________ the rate of weathering increase
  • Surface area rate of weathering
  • CHEMICAL WEATHERING :
    • Rocks are broken and
    • the chemical composition is also ___________
    CHANGED
    • OXIDATION OCCURS WHEN __________ FROM AIR COMBINES WITH ___________ TO FORM OXIDES
    OXYGEN MINERALS RUST
  • This was washed up on a beach!!
  • A rusty gate……
    • CARBONATION
    • OCCURS WHEN __________ CONTAINING
    • __________ ACID
    • DISSOLVES MINERALS
    WATER CARBONIC
  • EX. LIMESTONE CAVES
  •  
  •  
  • * POLLUTANTS can speed up the rate of chemical weathering
    • OXIDES OF SULFER
    • AND NITROGEN MAKE
    • RAINWATER UNNATURALLY
    • ACIDIC
    • ACID RAIN
    • HYDRATION
    • OCCURS WHEN _______ SUCH AS MICA AND FELDSPAR ABSORB ________ AND WEAKEN AND FORM ________
    MINERALS WATER CLAY
  •  
  • CLIMATIC EFFECTS ON WEATHERING :
    • PHYSICAL WEATHERING DOMINATES IN
    COLD, MOIST CLIMATES
  • CLIMATIC EFFECTS ON WEATHERING:
    • CHEMICAL WEATHERING DOMINATES IN
    WARM, MOIST CLIMATES
  • IN GENERAL WHEN THERE IS MORE THERE IS MORE WEATHERING MOISTURE
  • CLEOPATRA’S NEEDLE Central Park
  • RATE OF WEATHERING ALSO DEPENDS ON: MINERAL COMPOSITION ROCK RESISTANCE (HARDNESS)
  •  
  • SHALE SANDSTONE SHALE SANDSTONE LIMESTONE SHALE DOLOSTONE WHICH ROCK IS THE MOST RESISTANT TO WEATHERING? WATER
  • SHALE SANDSTONE SHALE SANDSTONE LIMESTONE SHALE DOLOSTONE WHICH ROCK IS THE MOST RESISTANT TO WEATHERING?
  • SHALE SANDSTONE SHALE SANDSTONE LIMESTONE SHALE WHICH ROCK IS THE LEAST RESISTANT TO WEATHERING? DOLOSTONE
  • SHALE SANDSTONE SHALE SANDSTONE LIMESTONE SHALE WHICH ROCK IS THE LEAST RESISTANT TO WEATHERING? DOLOSTONE
  • SOIL FORMATION: SOIL IS THE COMBINATION OF: ROCK PARTICLES MINERALS ORGANIC MATTER
  • THE END RESULT OF WEATHERING AND BIOLOGIC ACTIVITY IS: soil
  • Adding to a compost pile
  •  
  •  
  • EROSION
  • EROSION:
    • TRANSPORT OF SEDIMENTS
  • AND DEPOSITING THEM ELSEWHERE
  •  
  • EROSION IS DRIVEN BY THE FORCE OF GRAVITY
  • THE AGENTS OF EROSION ARE:
    • RUNNING WATER
    • WIND
    • MOVING ICE (GLACIERS)
  • Each Agent of Erosion Produces it’s Own Characteristic shape and Texture in the Sediment :
  •  
  • ROUNDS AND SMOOTHES THE ROCK SURFACE ALSO MAKES IT SMALLER
  • WIND BLOWN SEDIMENTS FROST AND PIT THE ROCK SURFACE
  • SMALL SEDIMENTS IN THE GLACIER POLISHES & SMOOTHES THE ROCK SURFACE LARGE SEDIMENTS SCRATCH AND STRIATE THE ROCK SURFACE
  • FALLEN ROCKS ARE SHARP & ANGULAR
  • RUNNING WATER The primary agent of erosion is:
  • Colorado River
  • Grand Canyon
  • Niagra Falls
  •  
  •  
  •