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 through which large rocks are broken into increasingly smaller pieces.
It involves mechanical processes that disintegrate a rock, like tree roots growing in cracks in a rock and eventually breaking it up. Mechanical weathering doesn't change the chemical nature of the rocks.
2.
A form of weathering where the grains of a rock become loosened and fall out, to leave a pitted, uneven surface.
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. Over time, trees can break apart even large rocks.
4.Chemical weathering is the weakening and subsequent disintegration of rock by chemical reactions . These reactions include hydration , hydrolysis , carbonation , oxidation and reduction . These processes either form or destroy minerals , thus altering of nature of the Rock's mineral composition
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. Water plays a very important role in chemical weathering in three different ways. First it combines with carbon dioxide in the soil to form a weak acid called carbonic acid. Finally, the water can break up minerals through hydrolysis.
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
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