地球之年歲
地質學、地球物理學斷曰，地球之歲蓋四十五億四千萬年（有誤差正負百分之一）。
何以得之？則以放射測年之法，定石之歲得之。觀世間至古之石、太陰之岩，其歲蓋與定歲測年之果同。亦可以放射性元素、同位素定歲，其果同。
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