permafrost

n. level of earth that is frozen all year round

This article is about frozen ground. For other meanings, see Permafrost (disambiguation). In geology, permafrost or permafrost soil is soil at or below the freezing point of water (0°C or 32°F) for two or more years. Ice is not always present, as may be in the case of nonporous bedrock, but it frequently occurs and it may be in amounts exceeding the potential hydraulic saturation of the ground material. Most permafrost is located in high latitudes (e.g. North and South poles), but alpine permafrost exists at high altitudes.
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Noun
1. ground that is permanently frozen
(hypernym) land, ground, soil

n. permafrost, level of earth that is frozen all year round

n. permafrost, level of earth that is frozen all year round