C. Answer the following questions in not more than 40 words.
1. Whats weathering? How does it differ from erosion?
2. What is the chief function of a river in its upper course? Name some distinctive features formed at this stag.
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2.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. When a river runs over alternating layers of hard and soft rock, rapids and waterfalls may form.Water and wind erosion are the two primary causes of land degradation; combined, they are responsible for about 84% of the global extent of degraded land, making excessive erosion one of the most significant environmental problems.
1..Erosion happens when rocks and sediments are picked up and moved to another place by ice, water, wind or gravity. Mechanical weathering physically breaks up rock.
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