The mountaineers carry oxygen cylinders with them while climbing mountains because the availability of air ______ as we go up in the atmosphere.

increases

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decreases

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stays the same

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Solution

The correct option is B decreases

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Question 13.4

A list of words is given in a box. Use appropriate words to fill up the blanks in the following statements.

Air, oxygen, wind, water vapour, mixture, combination,
direction, road, bottles, cylinders.

Mountaineers carry oxygen ___ with them, while climbing high mountains.

Statement I: Mountaineers carry oxygen cylinders with them while climbing high mountains.

Statement II: The percentage of oxygen in air decrease with increasing altitude.

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