permafrost

{
  "id": "MLC-T-AGR-004820",
  "term": "permafrost",
  "field": "Agriculture and food",
  "definition": "Permanently frozen ground; generally refers to a layer at some depth below the soil surface. Any layer above it, which thaws in summer, is termed the active layer.",
  "synonyms": [
    "permafrost areas"
  ],
  "subject": "Fields of Study",
  "see_also": [
    "soil morphological features",
    "cold soils",
    "frigid soils",
    "frozen soils"
  ],
  "references": [
    "Burns, Russell M. and Barbara H. Honkala, tech. coords. Silvics of North America, vol 2. Hardwoods; Glossary. Agriculture handbook no. 654. U.S. Department of Agriculture, Forest Service, 1990",
    "NAL Agricultural Thesaurus and Glossary"
  ],
  "translations": {
    "es": "hielo permanente"
  },
  "url": "https://mlchart.com/terminology/agriculture/permafrost/"
}