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3 February, 11:39

Why is the air at the top of a mountain hard to breathe compared to at sea level?

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  1. 3 February, 12:30
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    Because the oxygen we breathe is 20%.

    The further away from sea level the pressure of the atmosphere decreases meaning there is in fact less air to breathe. so when you are on a mountain the further you go up the less oxygen there is for you to breathe.
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