求翻译：Geology is a natural science. With it men can discover all kinds of useful minerals. Geology studies the earth. But of the three spheres, the atmosphere, the hydrosphere and the lithosphere, it only directly studies the lithosphere. It studies the composition and distribution of material in the earth’s crust. It studies also the formation, changes and development of rocks and minerals in the earth’s crust.是什么意思？

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