Which risk increases when unconfined pyroclastic flows cool rapidly?

💡 Explanation

Columnar jointing is more likely because thermal contraction generates stress; as the flow cools, fracturing occurs. Therefore, columnar joints develop rather than other phenomena that require different processes.

• Which risk increases for coastal wetlands when longshore drift is interrupted by artificial groynes?
• Which geological effect arises from the constant stress-and-release mechanism along a transform fault boundary intersecting continental crust?
• Which outcome occurs when stratovolcano magma traps gases?
• Which feedback causes increased shoreline erosion near an oxbow lake?
• Which ecological outcome results when groundwater extraction lowers the water table near a barrier island?
• Which outcome occurs at a subduction zone with shallow slab angle?