Chemistry
What allotrope of oxygen helps protect the biosphere from solar ultraviolet radiation?
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What is a mixture of gases that can be stored and transported like natural gas?
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What is the stinky gas associated with swamps and anaerobic decomposition?
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Compounds of what element are used in soaps, fertilizers, explosives, and matches?
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The Statue of Liberty is made of an iron frame with a sheet of what other metal hung over it?
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