"salt cave" meaning in English

{
  "forms": [
    {
      "form": "salt caves",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "salt cave (plural salt caves)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
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        {
          "kind": "topical",
          "langcode": "en",
          "name": "Geology",
          "orig": "en:Geology",
          "parents": [
            "Earth sciences",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A cave formed within rock salt by dissolution of this very soluble rock by water."
      ],
      "id": "en-salt_cave-en-noun-~K1osKCL",
      "links": [
        [
          "geology",
          "geology"
        ],
        [
          "cave",
          "cave"
        ],
        [
          "rock salt",
          "rock salt"
        ]
      ],
      "raw_glosses": [
        "(geology) A cave formed within rock salt by dissolution of this very soluble rock by water."
      ],
      "topics": [
        "geography",
        "geology",
        "natural-sciences"
      ],
      "translations": [
        {
          "code": "hu",
          "lang": "Hungarian",
          "sense": "a cave formed within rock salt",
          "word": "sóbarlang"
        }
      ],
      "wikipedia": [
        "salt cave"
      ]
    }
  ],
  "word": "salt cave"
}

{
  "forms": [
    {
      "form": "salt caves",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "salt cave (plural salt caves)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
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        "Pages with entries",
        "Terms with Hungarian translations",
        "en:Geology"
      ],
      "glosses": [
        "A cave formed within rock salt by dissolution of this very soluble rock by water."
      ],
      "links": [
        [
          "geology",
          "geology"
        ],
        [
          "cave",
          "cave"
        ],
        [
          "rock salt",
          "rock salt"
        ]
      ],
      "raw_glosses": [
        "(geology) A cave formed within rock salt by dissolution of this very soluble rock by water."
      ],
      "topics": [
        "geography",
        "geology",
        "natural-sciences"
      ],
      "wikipedia": [
        "salt cave"
      ]
    }
  ],
  "translations": [
    {
      "code": "hu",
      "lang": "Hungarian",
      "sense": "a cave formed within rock salt",
      "word": "sóbarlang"
    }
  ],
  "word": "salt cave"
}