問題 · 2026-05-26
地質紀元是地球歷史的時間分段,基於岩石和化石記錄來劃分。
地質紀元是地質學中用來分類地球歷史的時間單位,通常以百萬年為單位。主要包括太古代、元古代、古生代、中生代和新生代。每個紀元又可以進一步細分為紀、世和層,這些細分單位有助於更精確地描述地質時期的變遷。地質紀元之間的界線往往與大規模滅絕事件相關,例如古生代末期和中生代末期的生物滅絕事件。研究地質紀元有助於我們理解地球的歷史和演化過程,以及生命在地球上的發展歷程。
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