Which risk increases following a major pyroclastic eruption?

💡 Explanation

Widespread crop failure risks increase due to tephra deposition because ash blocks sunlight, inhibiting photosynthesis; therefore, yields decline rather than crop health improving by any form of nutrient enrichment from the deposit under these conditions. The dominant mechanism here is atmospheric fallout.

• Which risk increases following heavy agricultural irrigation over limestone?
• Which condition causes the formation of lobate features in solifluction areas with coarse boulder obstructions?
• Which erosional process is accelerated when freeze-thaw cycles occur within a cirque formation?
• In wetlands, which outcome from iron oxidation accelerating?
• Which geological effect arises from the constant stress-and-release mechanism along a transform fault boundary intersecting continental crust?
• Which land deformation results where groundwater extraction accelerates?