Weathering Process of disintegration of rock, minerals, and soil.
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Transcript of Weathering Process of disintegration of rock, minerals, and soil.
![Page 1: Weathering Process of disintegration of rock, minerals, and soil.](https://reader035.fdocuments.in/reader035/viewer/2022062516/56649dc65503460f94ab9e1e/html5/thumbnails/1.jpg)
Weathering•Process of disintegration of rock, minerals, and soil.
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Two Types
1. Mechanical Weathering2. Chemical Weathering
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Mechanical Weathering
1. Thermal2. Frost3. Pressure Release4. Hydraulic Action5. Salt Crystal Growth6. Biotic Growth7. Abrasion
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Thermal Weathering
• The rock heats up and expands by day and cools and contracts by night, its outer layers undergo stress and break.
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Frost• water gets in the cracks of rocks, freezes and
expands.• When the ice thaws, water can flow further into the
rock.
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Pressure Release
• Overlying rocks are removed by erosion causing the underlying rocks to expand and fracture parallel to the surface.
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Hydraulic Action
• Water from waves rush into cracks in the rock face. This process traps a layer of air in the crack, compressing it and weakening the rock.
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Salt Crystal Growth
• Solutions seep into cracks and evaporate, leaving salt crystals behind. These crystals expand as they are heated up, exerting pressure on the rock.
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Biotic Growth
• Seedlings sprout in a crack and plant roots exert pressure and provide a pathway for water.
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Abrasion (Wind or Water)
• The wearing of rocks by friction, resulting from collisions among rock, sand and silt.
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Chemical Weathering
• Solution (Carbonation)• Hydration• Hydrolysis• Oxidation• Sulfation• Biological
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Solution (Carbonation)
• When rain combines with CO2 and forms carbonic acid, which reacts with limestone.
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Hydration
• When rocks take up water, they increase in volume, creating stresses within the rock.
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Hydrolysis
• A chemical weathering process affecting silicate minerals that results in dissolution of original mineral.
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Oxidation
• Chemical oxidation of a variety of metals.• This process is better known as "rusting."
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Sulfation
• The addition of Sulfur Dioxide to limestone produces gypsum, which is soluble and is easily dissolved and washed away.
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Biological
• A number of plants and animals release of acidic compounds which breakdown rocks.