How does a blind valley form in karst?
Answer and explanation
Correct answer: When a surface stream ends at a sinkhole or ponor and goes underground
A blind valley is a karst valley whose surface stream disappears underground instead of continuing to an open downstream channel. This occurs when permeable, jointed limestone contains a sinkhole or ponor that captures the runoff and transfers it into the subterranean drainage system. Option A is correct. Sea cliffs, loess deposits, and drumlins are formed by marine, wind, and glacial processes and do not explain blind valleys.
Frequently asked questions
What is the correct answer to this question?
When a surface stream ends at a sinkhole or ponor and goes underground
Why is this the correct answer?
A blind valley is a karst valley whose surface stream disappears underground instead of continuing to an open downstream channel. This occurs when permeable, jointed limestone contains a sinkhole or ponor that captures the runoff and transfers it into the subterranean drainage system. Option A is correct. Sea cliffs, loess deposits, and drumlins are formed by marine, wind, and glacial processes and do not explain blind valleys.
Which subject and chapter does this question cover?
This is a Class 11 Accountancy question. Chapter: Introduction to Accounting. Topic: Accounting Information.
