A monochrome rainbow (one-color rainbow) appears at sunrise or sunset when the Sun’s light travels through more atmosphere (air)!
Weather - Facts for Kids

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Random Facts About Weather For Kids
Special cameras can see parts of a rainbow that our eyes can’t — like ultraviolet (UV) or infrared (heat) light — by detecting light beyond the colors humans can see!
Formation & Science
A thunderstorm forms when warm air rises quickly into cold air, just like a hot air balloon racing into the sky!
Red is always on the outside of a primary rainbow because red light bends the least when passing through water drops!
Formation & Science
A monsoon isn’t just rain — it’s a complete seasonal change in wind direction that brings months of wet weather!