B. Answer the following questions in detail :
1. Explain the process of mechanical weathering.
2. Explain Granular disintegration.
3. Give an account of the role of plants and animals in weathering.
4. Describe briefly the various processes involved in chemical weathering.
5. Explain the impact of temperature and frost on weathering.
6. How is hydration responsible for weathering of rocks? Explain.
7. Explain depositional work of wind.
8 "The river in the upper course develop typical landforms." Explain.
Answers
Answer:
1 Mechanical weathering is the process of breaking big rocks into little ones. ... That process occurs when the water inside of rocks freezes and expands. That expansion cracks the rocks from the inside and eventually breaks them apart. The freeze-thaw cycle happens over and over again and the break finally happens.
2 A form of weathering where the grains of a rock become loosened and fall out, to leave a pitted, uneven surface. André (2002) Geografiska A 84, 3–4 finds that the granular disintegration of crystalline rocks operates at the same rate whatever the environment. From: granular disintegration in A Dictionary of Geography »
3 Plants and animals can be agents of mechanical weathering. The seed of a tree may sprout in soil that has collected in a cracked rock. As the roots grow, they widen the cracks, eventually breaking the rock into pieces.
4 Chemical weathering is the process by which rocks are broken down by chemical reactions. ... When iron in rocks reacts with oxygen, it forms iron oxide, which weakens the rock. Carbonation is the mixing of water with carbon dioxide to make carbonic acid. This type of weathering is important in the formation of caves.
5
Frost weathering is common in mountain areas where the temperature is around the freezing point of water. ... The ice accumulations grow larger as they attract liquid water from the surrounding pores. The ice crystal growth weakens the rocks which, in time, break up.
6 As rust expands, it weakens rock and helps break it apart. Hydration is a form of chemical weathering in which the chemical bonds of the mineral are changed as it interacts with water. One instance of hydration occurs as the mineral anhydrite reacts with groundwater.
7 In deserts, wind picks up small particles and leaves behind larger rocks to form desert pavement. Moving sand may sand blast rocks and other features to create ventifacts. The sand is transported until it is deposited in a sand dune.
8 In the upper course of a river gradients are steep and river channels are narrow. Vertical erosion is greatest in the upper course of a river. As the result of this typical features include steep valley sides, interlocking spurs, rapids, gorges and waterfalls.
Explanation:
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