August 28, 2012
|We see a rainbow only when the raindrops are near perfectly spherical, and a snowflake with all its icy intricate surfaces and angles just cannot make one. Snow can form a rainbow-colored halo on the ground rather than in the sky. Snow crystals thaw and recrystallize slightly during daily temperature changes and morph into larger, simple crystals that glint brightly in sunlight to make a ground halo.|
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