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← GeographyWhich outcome arises from thermal expansion when permafrost degradation causes subsurface ice to melt disproportionately in a region?
A)Formation of Thermokarst sinkhole landscapes✓
B)Increased Soil Carbon Sequestration
C)Advancement of Boreal Forest Tree Lines
D)Stabilization of Arctic tundra ecosystems
💡 Explanation
Thermokarst landscapes arise through thaw settlement, because differential thawing and thermal expansion near the surface causes ground subsidence to happen through the mechanism of cryogenic weathering. Therefore, sinkholes are formed, rather than stabilization because of positive feedback loops due to albedo effects.
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