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Characteristics of Permafrost

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Multiple Choice

What is the definition of permafrost?

  1. A layer of soil, rock, and organic material that remains frozen for at least two consecutive years
  2. A layer of soil, rock, and organic material that remains frozen for at least one consecutive year
  3. A layer of soil, rock, and organic material that remains frozen for at least three consecutive years
  4. A layer of soil, rock, and organic material that remains frozen for at least four consecutive years
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