Multiple choice

Mountaineers carry oxygen cylinders with them because____

  1. oxygen supports combustion.

  2. mountain air is very polluted.

  3. air becomes thinner as we go higher.

  4. air becomes denser as we go higher.

  5. there is no oxygen on the mountains.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The air gets thinner as we go higher up towards space. When mountaineers climb very high peaks, they face Oxygen shortage due to less dense air and due to the  efforts being put in climbing, the need of their body increases .

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