我用岩枫木来做内心。

I used rock maple for the core.

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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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这些克洛·维斯文化的古印第安人利用公园里发现的大量的黒曜岩来制造这样的切割工具和武器。

These Paleo-Indians, of the Clovis culture, used the significant amounts of obsidian found in the park to make such cutting tools and weapons.

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