365bet中国官方网站

  • word of the day

    tufa

    tufa - 365bet中国官方网站 definition and meaning for word tufa

    Definition
    (noun) a soft porous rock consisting of calcium carbonate deposited from springs rich in lime
    Synonyms : calc-tufa
    Definition
    (noun) hard volcanic rock composed of compacted volcanic ash
    Synonyms : tuff
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