Which feature forms when a river leaves mountains and its slope decreases?
Answer and explanation
Correct answer: Alluvial fan
The governing concept is deposition caused by a sudden reduction in river gradient and velocity. When a stream emerges from a narrow mountain valley onto a plain, it can no longer carry all its sediment; gravel, sand and silt spread outward in a fan-shaped deposit called an alluvial fan. Hence, option A is correct. The other features are coastal, karst or glacial landforms.
Frequently asked questions
What is the correct answer to this question?
Alluvial fan
Why is this the correct answer?
The governing concept is deposition caused by a sudden reduction in river gradient and velocity. When a stream emerges from a narrow mountain valley onto a plain, it can no longer carry all its sediment; gravel, sand and silt spread outward in a fan-shaped deposit called an alluvial fan. Hence, option A is correct. The other features are coastal, karst or glacial landforms.
Which subject and chapter does this question cover?
This is a Class 11 Accountancy question. Chapter: Theory Base of Accounting.
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