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A study of ancient geological events suggests that Earth follows a 27.5-million-year cycle. These geologic events include volcanic activity, mass extinctions, plate reorganizations, and sea level rises. The researchers saw that the most recent cluster of geological events was approximately 7 million years ago.

一项对古代地质事件的研究表明，地球遵循一个2750万年的周期。这些地质事件包括火山活动、大规模灭绝、板块重组和海平面上升。研究人员看到，最近的地质事件群大约是在700万年前。