Archaean
(geology) The eon from 2,500 Ma to 4,000 Ma.
(intransitive) To stop functioning. (machine, computer, vehicle) / (intransitive) To collapse, physically or in structure. (unexpectedly) / (intransitive) To demolish, to pull down. (intentionally)
A surname.
Third-person singular simple present indicative form of unindex
クラトンに露出する始生代（約25億〜40億年前）の岩層は、地球最古の生命の化学的痕跡を保存している。
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