RATES OF WEATHERING

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RATES OF WEATHERING
Factors of Rates of Weathering 1. Parent Material
(The rocks themselves) - Igneous and metamorphic
most resistant, sedimentary least resistant
because of pores. 2. Surface Area 3. Climate -
Warm and wet chemical weathering Cold and
Dry mechanical weathering
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EROSION
EROSION - The breakup and removal of rock by
moving natural agents (rivers, glaciers, wind,
water)
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• Mass Movements
• General term used for rock fragments moving down
  a slope
• What is causing this erosion to occur?
• Can happen either fast or slow.

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Talus Slopes - Large piles of rock that break off
and pile up at the bottom of a hill
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• Landslides
• Sudden movement of masses of loose rocks.
• Triggered by
• Earthquakes
• Rainfall
• Thaws
• Volcanoes

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Mudflow - Fast movement of large masses of mud.
Occur in dry, mountainous regions during fast,
heavy rainfalls or volcanic eruptions
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Rockfall - Rocks falling from a steep cliff. This
is the most rapid type of mass movement.

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Creep - very slow down hill movement of weathered
rock material. Usually goes unnoticed unless it
hits a building or something. Creeps can include
rocks, plants, buildings, etc.
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SOILS
Soils - soil science PEDOLOGY Most important
result of weathering and erosion is soil Two
general classes of soil A. residual soil - soil
made from local bedrock B. Transport soil -
soil that was moved by wind, or glacier
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Factors determining soil makeupand Formation
1. Climate - Rainfall amount and temperature
(most important) 2. Parent Rock - Type and
chemical composition 3. Vegetation - Roots and
Leaves 4. Topography - hilliness, etc. 5. Time
- how long to develop