What is the permafrost and which biome has this?

Permafrost is ground that is permanently frozen. In the summer the top layer of permafrost may melt, but this only makes up the top ~3 feet or so. Below that the ground is permanently frozen. Permafrost can extend down more than 500 feet, although in some places the permafrost can be nearly a mile deep. read more

Permafrost is ground that is permanently frozen. In the summer the top layer of permafrost may melt, but this only makes up the top ~3 feet or so. Below that the ground is permanently frozen. read more

The soil in any tundra is all permafrost. Permafrost is soil that has been frozen. Permafrost can form in any place in the world the soil just has to be moist and the conditions must be cold. read more