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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Steptoean positive carbon isotope excursion ： ウィキペディア英語版 Steptoean positive carbon isotope excursion The Steptoean Positive Carbon Isotope Excursion (SPICE) was a geological event which occurred about 500 million years ago at the end of the Cambrian Period. The SPICE event was a sudden reversal of the anoxia (lack of oxygen) that had steadily spread throughout the oceans during the Cambrian which also affected the atmosphere. After the SPICE event, oxygen levels recovered and levels in the atmosphere may have risen as high as 30%, higher than the 21% of the atmosphere that prevails today. The sudden increase in oxygen led to an explosion of life across the globe. 〔 (Plankton Key to Origin of Earth's First Breathable Atmosphere, ScienceDaily, Feb. 21, 2011 ) 〕 ==References== 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「Steptoean positive carbon isotope excursion」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.