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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.
Altostratus evolves as a thin layer from a gradually thickening veil of cirrostratus and is usually grey or blue in colour with very few features.
Otherwise known as 'The King of Clouds', cumulonimbus clouds exist through the entire height of the troposphere, usually characterised by their icy, anvil-shaped top.
Travelling in fog can be extremely dangerous. Fog can drift rapidly and is often patchy.
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