亿万年前石化玛瑙树干

in cn •  5 months ago 

亚利桑那州的石化玛瑙树干，亿万年前的树木被埋在地下，在漫长岁月中经历地质变迁和矿化作用，才形成了如今五彩斑斓的宝石树。
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cn
5 months ago by

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