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The 993–994 carbon-14 spike was a rapid increase in carbon-14 content from tree rings, and followed the 774–775 carbon-14 spike. It may have come from a massive solar storm. ==See also== * List of solar storms 抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「993–994 carbon-14 spike」の詳細全文を読む スポンサード リンク
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