Physics
Water boils at a lower temperature on the hills because

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

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Physics
The wall of a dam is broader at the base

To withstand pressure that is increased with atmospheric pressure
Because streamlining is required
To withstand pressure that increases in a horizontal plane
To withstand pressure that increases with depth

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