Environmental
Permafrost in Alaska is defined as:
AFrozen topsoil that thaws every spring
BGround that remains at or below freezing temperature for two or more consecutive years✓ Correct
CPermanently frozen water bodies
DIce sheets covering the Alaska Range
Explanation
Permafrost is ground (soil or rock) that remains at or below 0°C (32°F) for at least two consecutive years. It underlies approximately 80% of Alaska and creates significant challenges for construction, including foundation instability when permafrost thaws.
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