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# WORK_TITLE: 地球之年歲
# DISPLAY_TITLE: 地球之年歲
# AUTHOR:
# TIMES:
# PAGE_TITLE: 地球之年歲
# CATEGORIES:
地球之貌
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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