7 types of rainbows: Nature's mesmerizing optical phenomena
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BY SADE AGARD
SCIENCE
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A primary rainbow is the most common type of rainbow produced by the sun. It occurs when light is refracted or bent as it passes through water droplets in the atmosphere.
Some rainbows even appear upside down. For instance, a circumzenithal arc, is created when sunlight passes through ice crystals in high-level cirrus clouds.