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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.
Contrails are frequently seen criss-crossing the sky and are created from water vapour coming out of an aircraft's engines.
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.
Impacts on small-scale wind power generation
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