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Weathering - Solution The solution of soluble minerals e.g...

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Weathering LI>Weathering is the breaking and decomposition of rocks at/near the earth's surface by physical & chemical processes. There are two main types of weathering: 1. Chemical Weathering: This involves the decomposition of rocks due to chemical reactions between rock minerals, water and some atmospheric gases such as oxygen and carbon dioxide. The main types of chemical reactions are: 1. Hydration: This is the absorption of water by rock minerals. 2. Oxidation: This is when oxygen is taken up by a mineral compound. 3. Carbonation: this is when hydrogen carbonate ions combine with a mineral to give a soluble compound which can then be carried away in solution. 4.
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Unformatted text preview: Solution: The solution of soluble minerals e.g. limestone in rocks. 5. Hydrolisis: The reaction between the hydrogen ions in water and some metal ions. 2. Mechanical Weathering: 1. Temperature changes causing expansion and contraction of rocks. 2. Freezing of water--frost action. 3. Wetting and Drying Factors Influencing the Character and Rate of Weathering These factors include: • Climate o The greater the amount of rainfall the higher the rate of chemical weathering. o Temperature changes accelerate the rate of mechanical weathering. • The nature of the parent rock. • Vegetation cover • The gradient of the slope • Time • Man's activities...
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