《地球的年龄》是民国16年商务印书馆出版的图书。
估计地球的年龄大约为46亿年。
The age of the earth is reckoned at about 4 600 million years.
自从文明出现以来，人们就一直对地球的年龄感到好奇。
Since the dawn of civilization, people have been curious about the age of Earth.
人们曾试图根据现存沉积岩的厚度和目前海洋的盐度水平来计算地球的年龄。
Attempts were made to calculate Earth's age from the thickness of surviving sedimentary rock and from the current level of the oceans' salinity.
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