Why can a dry valley occur in a karst region?
Answer and explanation
Correct answer: Former surface drainage may have shifted underground
In a karst landscape, water can dissolve joints and enlarge fissures into underground channels. A stream that once flowed across the surface may therefore be captured by a swallow hole or sinking point and continue below ground. The former valley remains as a dry valley, making option A correct. The other options describe processes that do not explain this drainage change.
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What is the correct answer to this question?
Former surface drainage may have shifted underground
Why is this the correct answer?
In a karst landscape, water can dissolve joints and enlarge fissures into underground channels. A stream that once flowed across the surface may therefore be captured by a swallow hole or sinking point and continue below ground. The former valley remains as a dry valley, making option A correct. The other options describe processes that do not explain this drainage change.
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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