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← GeographyWhich landscape change accelerates when permafrost thaw increases earthworm bioturbation?
A)Methanogenesis from released organic material✓
B)Cryoturbation induced patterned ground formation
C)Increased albedo due to boreal forest
D)Glacial abrasion of exposed bedrock
💡 Explanation
Increased bioturbation from earthworms mixes newly thawed, previously frozen organic matter, promoting methanogenesis because anaerobic decomposition is enhanced under saturated conditions; therefore methane release increases, rather than cryoturbation, albedo changes, or glacial abrasion dominating.
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