Physics
Water boils at a lower temperature on the hills because

It is cold on the hills
There is a decrease in air pressure on the hills
There is less oxygen
There is less carbon dioxide on the hills

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Physics
Lightning is produced when

Clouds strike against impurities in air and the friction burns up these impurities
Water vapour produces electricity in the clouds
Similar charges of electricity rush towards each other and then get repelled
Strong opposite charges in different clouds break down the resistance offered by the intervening air

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