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The sky appears blue to the human eye as the short waves of blue light are scattered more than the other colours in the spectrum, making the blue light more visible.
All high clouds are a type of cirrus, a common cloud that can be seen at any time of the year.
The classification of clouds into types was first proposed by Luke Howard in 1802 and we largely use the same system today splitting clouds into three main types - stratus, cumulus and cirrus.
Sometimes pipes freezing and thawing can cause them to burst. Find out what to do to get up and running again.
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