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Earth |
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| An oxygen-rich and protective atmosphere, moderate temperatures, abundant water, and a varied chemical composition enable Earth to support life, the only planet known to harbor life. The planet is composed of rock and metal, which are present in molten form beneath its surface. The Apollo 17 spacecraft took this snapshot in 1972 of the Arabian Peninsula, the African continent, and Antarctica (most of the white area near the bottom). | ||||||
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| NASA/Science Source/Photo Researchers, Inc. | ||||||
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| Appears in these articles: | ||||||
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| Biosphere; Earth (planet); Ecology | ||||||
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