Which mechanism forms elevated cave entrances over time?

💡 Explanation

Entrances elevate via differential fluvial downcutting because surface streams erode valley floors faster than cave levels; therefore, entrances appear higher relative to current ground level rather than by tectonic uplift or other processes.

• Which phenomenon accelerates when permafrost thaws beneath an Arctic roadbed?
• Which volcanic phenomenon develops when viscous lava accumulates rapidly over a vent on steep terrain?
• Which effect results when intensifying trade winds strengthen the subtropical gyres in the Pacific Ocean?
• Which mechanism forms bowl-shaped depressions specifically called cirques?
• Which risk increases when a rhyolitic lava dome nears collapse?
• Which outcome occurs following the moraine dam failure surrounding an alpine lake?