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प्रश्न
What are the main types of chemical weathering?
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उत्तर
Water plays an important role in chemical weathering. Rock is a mixture of many minerals. Water is a universal solvent. Many things get dissolved easily in water. The solubility increases because the matter has dissolved in water. And those materials which do not dissolve easily in water get dissolved in such solutions. In areas that receive heavy rainfall, chemical weathering occurs in the following way.
- Carbonation: The rainwater travels through the atmosphere before reaching the ground. Carbon dioxide in the air gets mixed in the water in this process. Dilute carbonic acid gets formed. Materials like limestone get easily dissolved in such acids.
- Solution: Some minerals in the rock get dissolved in water. Limestone is formed due to chemical precipitation between water and alkalis. Similarly, because of solution, alkalis in the rock dissolve and make them brittle.
- Oxidation: This process occurs in rocks which have iron present in them. The iron in the rock comes in contact with water and chemical reaction takes place between iron and oxygen. Hence, a reddish coloured layer forms on the rocks.
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संबंधित प्रश्न
What do you understand by controlled grazing?
How do animals and plants assist in weathering?
Say whether the following is ‘True’ or ‘False’.
In Polar regions there is no chemical weathering.
Name the gases involved in the process of chemical weathering.
Rewrite the following sentence, choosing the right word from the options given below:
_______ occurs when the water itself combines chemically with some element or mineral.
Rewrite the following sentence, choosing the right word from the options given below:
_______ is the chemical process in which some of the minerals are dissolved by the water.
Distinguish between the following :
Solution and Hydration
Give reasons for the following :
Presence of water aids chemical weathering.
Mixing of water with the atmospheric carbon-di-oxide is known as ______.
Hydration comes under ______.
