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Weathering, soil formation, & erosion processes
 

Weathering, soil formation, & erosion processes

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Chemical or Physical weathering, agents, and process 9th grade

Chemical or Physical weathering, agents, and process 9th grade

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    Weathering, soil formation, & erosion processes Weathering, soil formation, & erosion processes Presentation Transcript

    • Weathering, Soil Formation & Erosion Processes by Ann C Cloutier 2011 Earth & Space
    • Can you hypothesize how the circle shapes were made ? ann c cloutier 2011 copyright
    • Water is a powerful forcein chemical and physical (mechanical) weathering • Temperature and pressure are major factors in the process of mechanical weathering • Changes in temperature can cause a rock to split • Chemical weathering is a reaction between the rocks and water • It can result in the formation of new rocks and minerals ann c cloutier 2011 copyright
    • Agents of erosion erosion is the process that moves weathered pieces of rocks to new locations (transport and deposition)• Moving water in streams and oceans• Glaciers*• Wind• Gravity• Gravity is the force behind most agents of erosion ann c cloutier 2011 copyright
    • Caves and Karst topography are examples ofchemical erosion and the new formation of other rock types ann c cloutier 2011 copyright
    • Soil Horizons soil is made up of weathered rocks and humus, which is decayed organic matter in soil ann c cloutier 2011 copyright
    • Loess soil is great for the “Bread Basket” USA agricultural crops• Soil is residual or transported• Residual soil remains on top of its parent rock• Transported soil is moved to a location away from its parent bedrock by water, wind and glaciers ann c cloutier 2011 copyright
    • Plant acids, roots, acid rain = chemical weathering ann c cloutier 2011 copyright
    • Who are the agents of erosion ?• Wind • Particles and sediments must be very tiny <2mm for the wind to pick up • Water is fluid and flows downward;• Water depending on the volume of water, the slope it is descending and its velocity, will determine how and what it can move• Gravity • Gravity makes rocks and sediments roll downward; usually unsorted and mixed particle sizes • Glaciers are the BIG movers and• Glaciers shakers of land formation; Sheets of glacial ice can sandpaper bedrocks, make grooves, pluck mountain tops off and mix everything up ann c cloutier 2011 copyright
    • The end of acid rain ? ann c cloutier 2011 copyright