Which risk increases closest to the surface when significant rainwater infiltration causes cave roof thinning?

💡 Explanation

Roof thinning increases the risk of a sinkhole because subsidence occurs as rainwater dissolves supporting limestone via chemical weathering, therefore collapse increases surface load requirements, rather than increased gas risks deeper down.

• Which effect reduces jet stream intensity when approaching high-latitude boundary zones?
• Which risk increases when coastal sediment transport stops due to a dam interrupting longshore drift?
• Which mechanism accelerates lake eutrophication when agricultural runoff contains excessive nutrients?
• Which consequence results when a mid-latitude meander in the Jet Stream stalls?
• Which outcome occurs during cave formation with concentrated groundwater flow?
• Which risk escalates inside deep canyons cutting through pyroclastic deposits?