Physics
Water boils at a lower temperature on the hills because

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

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Physics
Mirage is due to:

Unequal heating of different parts of the atmosphere
Magnetic disturbances in the atmosphere
Depletion of ozone layer in the atmosphere
Equal heating of different parts of the atmosphere

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