What may happen to an old cave when the water table falls in karst?
Answer and explanation
Correct answer: It may change from an active phreatic passage to a dry higher cave
A phreatic cave is active while groundwater fills the passage and dissolves the surrounding limestone. If the water table falls, the former conduit may become unsaturated, dry, and perched above the new groundwater level. It then records an older stage of karst development and may be called a relict or fossil passage. Option A is correct; the other choices are unrelated depositional landforms.
Frequently asked questions
What is the correct answer to this question?
It may change from an active phreatic passage to a dry higher cave
Why is this the correct answer?
A phreatic cave is active while groundwater fills the passage and dissolves the surrounding limestone. If the water table falls, the former conduit may become unsaturated, dry, and perched above the new groundwater level. It then records an older stage of karst development and may be called a relict or fossil passage. Option A is correct; the other choices are unrelated depositional landforms.
Which subject and chapter does this question cover?
This is a Class 11 Accountancy question. Chapter: Bills of Exchange.
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