Which geological feature results when carbonation weathered limestone collapses underground?

💡 Explanation

Karst sinkhole expansion occurs due to the dissolution of limestone bedrock by slightly acidic rainwater, creating underground cavities. The carbonate dissolution weakens the rock; therefore, the surface collapses, forming a sinkhole, rather than the described alluvial, glacial, or fluvial formations.

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• Which mechanism causes decreased stream meandering with increased gradient?
• Which phenomenon is intensified when the ascending branch of a Hadley cell overlaps with a warm ocean current?
• Which consequence directly results when intense aridity limits 'bioturbation' in semi-arid soils?
• Which outcome results when river sediment deposition patterns shift?