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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.
The range of ways in which clouds can be formed and the variable nature of the atmosphere results in an enormous variety of shapes, sizes and textures of clouds.
Learn how to protect yourself in a thunderstorm.
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