Which geomorphic outcome accelerates when Arctic permafrost thaws containing large amounts of trapped organic matter?

💡 Explanation

When organic-rich permafrost thaws, microbial decomposition increases because formerly frozen organic matter becomes available as a substrate, releasing carbon dioxide and methane, which accelerates soil subsidence and thermokarst formation. Therefore thermokarst expansion results, rather than carbon sequestration, methane reduction or albedo increases which require preservation or buildup of ice & vegetation cover.

• Which outcome results as increased sediment load alters braided river morphology transversing an alluvial plain?
• Which outcome is expedited when barrier island vegetation removal occurs?
• Which atmospheric effect weakens during an El Niño event, leading to altered rainfall patterns?
• Which mechanism causes the formation of braided river channels in alluvial fans experiencing heavy sediment load?
• Which process primarily causes increased sea stack formation on headlands?
• Which land deformation results where groundwater extraction accelerates?