Question

The mountaineers carry oxygen with them because: 
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Answer 1

Explanation:

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Mountaineers carry an oxygen cylinder along with them. It is because when they climb mountains, as altitude increases, the amount of oxygen level in the atmospheric air decreases as trees are not found at higher altitudes. As a result, mountaineers suffer from dizziness.

Answer 2

Explanation:

because atmospheric pressure decrease with every altitude of 8 or 10m