People climbing high mountains carry cylinders containing ______gas in them

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Solution

when we go upward in mountains the level of oxygen in the air decreases and due to lack of oxygen they feel tired so normally mountaineers have used the oxygen cylinder when they go for trekking.
People climbing high mountains carry cylinders containing oxygen gas in them

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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.

Question 4

Mountaineers carry oxygen cylinders with them because :

a) There is no oxygen on high mountains.

b) There is deficiency of oxygen on mountains at high atltitude.

c) oxygen is used for cooking.

d) oxygen keeps them warm at low temperature.

Why do mountaineers carry oxygen cylinders with them when they climb 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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