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 a decrease in air pressure on the hills
There is less oxygen

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Physics
Holography is a technique of

Recording a permanent, sharp two diimensional black and white or multicolour photograph
Recording a permanent three dimensional photograph of a given single colour or a multicolour
Recording a permanent three dimensional multicolour photograph
Recording a permanent three dimensional black and white photograph

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