The tundra and subarctic zones in Russia and the Near Abroad are permanently frozen to a depth of three meters. What is this permanently frozen layer called?

Name: The tundra and subarctic zones in Russia and the Near Abroad are permanently frozen to a depth of three meters. What is this permanently frozen layer called?
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Question

The tundra and subarctic zones in Russia and the Near Abroad are permanently frozen to a depth of three meters. What is this permanently frozen layer called? ​

Quizplus · Accepted Answer

Permafrost refers to the permanently frozen layer of soil or subsoil, found in the tundra and subarctic zones, which can extend to depths more than three meters.

The Tundra and Subarctic Zones in Russia and the near Abroad