Which consequence results when volcanic ashfall is extensive above mature forests?

💡 Explanation

Widespread dieback happens because shading from ash decreases forest photosynthetic capacity via light attenuation, rather than increased nutrients, so only ash-tolerant species survive; therefore forests suffer dieback, rather than benefiting from ash.

• Which mechanism causes coastal dune formation along lake shorelines with strong prevailing winds?
• Which geomorphic consequence arises when storm surges overtop a barrier island?
• Which feedback consequence accelerates stalactite growth in temperate climates?
• Which phenomenon exacerbates collapse-sinkhole formation during intense rainfall on karst?
• Which process increases discharge variability downstream in alluvial rivers?
• Which outcome occurs when glacial outwash encounters standing freshwater?