Provided that in each case heat input is the same, boiling takes place more quickly
1) at sea level.
2) in a valley.
3) in the mountains.
This is because
4) increased pressure on the surface of a liquid lowers its boiling point.
5) decreased pressure on the surface of a liquid lowers its boiling point.
6) water always boils quickest at sea level.
Answer: 3, 5
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