Examples of Mechanical Weathering

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Examples of Mechanical Weathering
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Frost Wedging

• Water freezes in rock cracks, crevices
• Frozen water expands 10
• Expansion shatters and cracks the rock

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Field of Frost Shattered Rocks

• Strawberry Mountain Eastern Oregon

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Root Wedging

• Similar to Frost Wedging
• Roots grow into rocks, cracking and breaking them
  into smaller pieces

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Examples of Chemical Weathering
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Acid Rain

• Pollutants released into the atmosphere combine
  with water droplets
• These droplets then become slightly acidic and
  fall to the earth

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Effects of Acid Rain
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Rust

• Cars and Mailboxes arent the only things that
  rust
• Many rocks contain iron which can also rust or
  oxidize
• This oxidization expands or breaks up the rock
• Ayers Rock, Australia

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Statue of Liberty

• This American Icon has been affected by chemical
  weathering
• She was originally a copper color
• She has been weathered and has become a light
  green color

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Erosion

• The Movement of Weathered Materials
• 3 Types
• Water
• Wind
• Glacial

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Examples of Water Erosion
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V-Shaped Canyons

• Water erosion in the form of rivers or streams
  create the deepest canyons on earth
• Canyons created by water have a distinct V shape

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Ocean Waves

• Waves carry extremely erosive power

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Jump Off Joe Oregon

• 1890
• 1920
• 1970

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Wind Erosion

• Wind carries and deposits sediment
• Wind can move sediment up and downhill
• Build dunes
• Carve cliff faces

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Pavement in the Desert?
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Examples of Desert Pavement

• Lighter particles (sand) are blown away
• Larger rocks are left behind
• Creating Pavement

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Glacial Erosion

• Glaciers are huge, slow moving, rivers of ice
• They move boulders and sediment trapped in the
  ice as they flow

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Moraines

• The rocks that are plucked and carried in
  glaciers are called moraines
• Notice the lines of rocks or moraines
• These rocks will be dropped or deposited at the
  end of the glacier

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Glacier Diagrams
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U-Shaped Valley