Permafrost and the Mountains
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Multiple Choice
What is permafrost?
- Permafrost is a layer of soil that remains frozen for two or more consecutive years.
- Permafrost is a layer of soil that remains frozen for at least one year.
- Permafrost is a layer of soil that remains frozen for at least three consecutive years.
- Permafrost is a layer of soil that remains frozen for at least four consecutive years.