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2)why does the top of a pond freeze long before the middle and bottom?
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Because that is where the cold air is, touching the top of the water. Heat is drawn out of the top layer of water first, therefore it freezes first. In time that layer of ice may even insulate the lower water from freezing.
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3)finally why do stars look red, white or blue but never other colours like green etc.
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I would say that they do appear all colours but green may be less common as it is lower on the visible light spectrum than red(roygbiv). The reasons we see coloured stars is because the light coming from stars is filtered via our atmosphere.
Those are my two stabs at your questions, as for the first one.... I'd only have guess as to why that is, bit I am sure some other TFP'er will step up.