"địa tầng" meaning in Vietnamese

{
  "etymology_templates": [
    {
      "args": {
        "1": "vi",
        "2": "地層"
      },
      "expansion": "",
      "name": "etymid"
    },
    {
      "args": {
        "1": "vi",
        "2": "zh",
        "3": "地層//",
        "pos": "SV: <i class=\"Latn mention\" lang=\"vi\">địa tằng</i>",
        "t": "",
        "tr": "-"
      },
      "expansion": "Chinese 地層 (SV: địa tằng)",
      "name": "der"
    },
    {
      "args": {
        "1": "地層",
        "2": "",
        "3": "địa tằng",
        "hv": "no"
      },
      "expansion": "Non-Sino-Vietnamese reading of Chinese 地層 (SV: địa tằng)",
      "name": "vi-etym-sino"
    }
  ],
  "etymology_text": "Non-Sino-Vietnamese reading of Chinese 地層 (SV: địa tằng).",
  "head_templates": [
    {
      "args": {
        "1": "vi",
        "2": "noun",
        "3": "",
        "4": "",
        "head": "",
        "tr": ""
      },
      "expansion": "địa tầng",
      "name": "head"
    },
    {
      "args": {},
      "expansion": "địa tầng",
      "name": "vi-noun"
    }
  ],
  "lang": "Vietnamese",
  "lang_code": "vi",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Vietnamese entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "vi",
          "name": "Geology",
          "orig": "vi:Geology",
          "parents": [
            "Earth sciences",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "stratum"
      ],
      "id": "en-địa_tầng-vi-noun-YWvgZUXl",
      "links": [
        [
          "geology",
          "geology"
        ],
        [
          "stratum",
          "stratum"
        ]
      ],
      "raw_glosses": [
        "(geology) stratum"
      ],
      "topics": [
        "geography",
        "geology",
        "natural-sciences"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ʔɗiə˧˨ʔ təŋ˨˩]",
      "tags": [
        "Hà-Nội"
      ]
    },
    {
      "ipa": "[ʔɗiə˨˩ʔ təŋ˦˩]",
      "tags": [
        "Huế"
      ]
    },
    {
      "ipa": "[ʔɗiə˨˩˨ təŋ˨˩]",
      "note": "Saigon"
    }
  ],
  "word": "địa tầng"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "vi",
        "2": "地層"
      },
      "expansion": "",
      "name": "etymid"
    },
    {
      "args": {
        "1": "vi",
        "2": "zh",
        "3": "地層//",
        "pos": "SV: <i class=\"Latn mention\" lang=\"vi\">địa tằng</i>",
        "t": "",
        "tr": "-"
      },
      "expansion": "Chinese 地層 (SV: địa tằng)",
      "name": "der"
    },
    {
      "args": {
        "1": "地層",
        "2": "",
        "3": "địa tằng",
        "hv": "no"
      },
      "expansion": "Non-Sino-Vietnamese reading of Chinese 地層 (SV: địa tằng)",
      "name": "vi-etym-sino"
    }
  ],
  "etymology_text": "Non-Sino-Vietnamese reading of Chinese 地層 (SV: địa tằng).",
  "head_templates": [
    {
      "args": {
        "1": "vi",
        "2": "noun",
        "3": "",
        "4": "",
        "head": "",
        "tr": ""
      },
      "expansion": "địa tầng",
      "name": "head"
    },
    {
      "args": {},
      "expansion": "địa tầng",
      "name": "vi-noun"
    }
  ],
  "lang": "Vietnamese",
  "lang_code": "vi",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Pages with 1 entry",
        "Pages with entries",
        "Vietnamese entries with incorrect language header",
        "Vietnamese lemmas",
        "Vietnamese nouns",
        "Vietnamese terms derived from Chinese",
        "Vietnamese terms with IPA pronunciation",
        "vi:Geology"
      ],
      "glosses": [
        "stratum"
      ],
      "links": [
        [
          "geology",
          "geology"
        ],
        [
          "stratum",
          "stratum"
        ]
      ],
      "raw_glosses": [
        "(geology) stratum"
      ],
      "topics": [
        "geography",
        "geology",
        "natural-sciences"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ʔɗiə˧˨ʔ təŋ˨˩]",
      "tags": [
        "Hà-Nội"
      ]
    },
    {
      "ipa": "[ʔɗiə˨˩ʔ təŋ˦˩]",
      "tags": [
        "Huế"
      ]
    },
    {
      "ipa": "[ʔɗiə˨˩˨ təŋ˨˩]",
      "note": "Saigon"
    }
  ],
  "word": "địa tầng"
}