In which condition can an alluvial fan form?
Answer and explanation
Correct answer: When a hill stream enters a plain and loses speed
An alluvial fan forms where a fast mountain stream leaves a narrow, steep valley and enters a broad plain. The sudden reduction in slope and velocity lowers the stream’s carrying capacity, so gravel, sand, and silt are deposited in a spreading fan shape. Option D is correct. Marine erosion, glacial ice deposition, and a river deepening into the sea do not describe the usual formation process of an alluvial fan.
Frequently asked questions
What is the correct answer to this question?
When a hill stream enters a plain and loses speed
Why is this the correct answer?
An alluvial fan forms where a fast mountain stream leaves a narrow, steep valley and enters a broad plain. The sudden reduction in slope and velocity lowers the stream’s carrying capacity, so gravel, sand, and silt are deposited in a spreading fan shape. Option D is correct. Marine erosion, glacial ice deposition, and a river deepening into the sea do not describe the usual formation process of an alluvial fan.
Which subject and chapter does this question cover?
This is a Class 11 Accountancy question. Chapter: Bills of Exchange. Topic: Introduction and Concepts.
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