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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.
Nacreous clouds form in the lower stratosphere over polar regions when the sun is just below the horizon. The clouds are illuminated from below and often glow in vivid colours and will often remain visible for a couple of hours af
In a cloud sunlight is scattered equally meaning that the sunlight continues to remain white and giving clouds their distinctive white appearance.
Clearing snow and ice from the pavement outside your home or public spaces can help prevent slips and falls. Here's some handy advice issued by the Department for Transport.
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