Why do some people experience headaches when they go for trekking in the mountains?

Atmospheric pressure increases.

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Atmospheric pressure decreases.

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Temperature increases.

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Temperature decreases.

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Solution

The correct option is B Atmospheric pressure decreases.
Some people experience headaches when they go for trekking in the mountains because of the decrease in atmospheric pressure. Air near the surface is held by force of gravity that is why it's denser and hence has high pressure. As the height increases, the hold of gravity reduces. Air spreads out and the number of air molecules in a unit volume decreases and hence air pressure decreases too.

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