Physics
Water boils at a lower temperature on the hills because

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

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Physics
Solids have definite shapes.This is because

The forces of adhesion are large
The forces of cohesion are very large
The forces of cohesion of the molecules within are very much less in them
The forces of adhesion are less

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