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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.
These lens-shaped orographic wave clouds form when the air is stable and winds blow across hills and mountains from the same or similar direction at different heights through the troposphere.
What are crepuscular rays? Learn more about how they form.
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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