Why is a waterfall likely to form in a hanging valley?
Answer and explanation
Correct answer: The tributary valley remains at a higher level than the main valley
The governing concept is differential glacial erosion. A powerful main glacier usually deepens its U-shaped valley more than a smaller tributary glacier can deepen its valley. After the ice retreats, the tributary valley is left perched above the main valley; the stream must descend across this abrupt step, commonly producing a waterfall. The other options do not explain the characteristic height difference, so A is correct.
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What is the correct answer to this question?
The tributary valley remains at a higher level than the main valley
Why is this the correct answer?
The governing concept is differential glacial erosion. A powerful main glacier usually deepens its U-shaped valley more than a smaller tributary glacier can deepen its valley. After the ice retreats, the tributary valley is left perched above the main valley; the stream must descend across this abrupt step, commonly producing a waterfall. The other options do not explain the characteristic height difference, so A is correct.
Which subject and chapter does this question cover?
This is a Class 11 Accountancy question. Chapter: Recording of Transactions (I & II). Topic: Covers the accounting equation.
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