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← GeographyWhich long-term outcome results when bioturbation weakens permafrost?
A)Increased methane release from thermokarst✓
B)Increased silicate weathering soil enrichment
C)Glacial isostatic rebound acceleration
D)Decreased salinity in tundra lakes
💡 Explanation
Increased soil churning from bioturbation destabilizes the frozen organic matter, accelerating thaw; this accelerates decomposition via microbial respiration rather than other outcomes, therefore leads to increased methane release forming thermokarst, because permafrost integrity has declined.
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