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07. Weathering and Soil_06

07. Weathering and Soil_06 - Objectives for Weathering and...

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Objectives for Weathering and Soil 1) What is the agent that performs chemical weathering, and what are the two principal reservoirs of acid forming materials for this agent? Primarily done by acidic water - Rain picks up material from the atmosphere to become acidic Carbon dioxide – Carbonic acid Sulfur oxide – Sulfuric acid Once rain enters the ground it usually picks up more carbon from decaying organic material and becomes more acidic. 2) What happens to the following minerals when acted upon by acidic water: quartz, feldspar, iron-silicates? Feldspar – turns into clay Iron-silicates – turns to rust Quartz – turns to quartz 3) Know the six forms of mechanical weathering and the basic mechanism of each. 1. Impact ( rock hitting rock, water hitting rock ) 2. Abrasion ( impact with small, sand, silt, clay, sand blasting in wind ) 3. Frost Wedging ( water in cracks freezing and thawing ) 4. Root Wedging ( roots from trees 0 5. Salt Wedging ( salt is deposited in rock, and temp makes salt expand )
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