Discussion
Assertion (A): A Karst topography is characterized by the formation of stalactites and stalagmites.
Reason (R): Solution is a dominant process in the development of land forms in Karst Region.
Answer: B
The answer is that both A and R are true but R is not the correct explanation of A.
Karst topography forms on soluble limestone. Rainwater carrying carbon dioxide dissolves the rock, so solution is the dominant process in shaping karst landforms such as sinkholes, swallow holes and caves. The reason is true.
Stalactites and stalagmites are also characteristic of karst, so the assertion is true. But they are formed by deposition: water dripping in caves loses carbon dioxide and precipitates calcium carbonate. Solution explains the caves, not the dripstone formations inside them, so the reason does not explain the assertion.
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