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Answered 2012-10-11 17:51:29

very high temperature is needed to combine hydrogen and oxygen.

at that temperature, water exists in gaseous form

Oxygen exists as a gas in our atmosphere, because there isn't very much hydrogen in the atmosphere. If the Earth's atmosphere contained a substantial amount of hydrogen mixed with the oxygen, it would be an explosive mixture. Any spark would set it off. They the oxygen and hydrogen would combine to form water, and we would be left without enough oxygen to breathe.

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