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Factors of Rates of Weathering and Erosion

Learn about the factors influencing rates of weathering and erosion, including parent material, surface area, climate, and soil formation. Understand the processes involved in mass movements like landslides, mudflows, rockfalls, and creep. Delve into soil science, including the impact of climate, parent rock, vegetation, topography, and time on soil formation.

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Factors of Rates of Weathering and Erosion

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  1. 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

  2. EROSION EROSION - The breakup and removal of rock by moving natural agents (rivers, glaciers, wind, water)

  3. 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.

  4. Talus Slopes - Large piles of rock that break off and pile up at the bottom of a hill

  5. Landslides • Sudden movement of masses of loose rocks. • Triggered by: • Earthquakes • Rainfall • Thaws • Volcanoes

  6. Mudflow - Fast movement of large masses of mud. Occur in dry, mountainous regions during fast, heavy rainfalls or volcanic eruptions

  7. Rockfall - Rocks falling from a steep cliff. This is the most rapid type of mass movement.

  8. 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.

  9. 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

  10. 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

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