Which risk increases when lava cools rapidly subaerially?

💡 Explanation

Increased surface area from rapid cooling promotes fracture formation via thermal contraction; this results in uneven, blocky A'a formation because the differential cooling stresses fragment the surface unevenly, therefore A'a lava forms rather than smoother pahoehoe lava.

• Near volcanic vents lacking water sources, which process primarily determines the viscosity of emerging lava?
• Which geographical effect influences the angle of deflection due to the Coriolis effect on ocean currents strongest?
• Which outcome results when a meandering stream breaches its levee system during high discharge?
• Which outcome occurs when rapid tectonic uplift intersects an established alluvial plain?
• Which outcome results from increased precipitation in karst cave systems?
• Which outcome results when vegetation cover is removed, triggering increased frequency of deflation events on loess deposits?