red snow

red snow

noun
snow that has acquired a red color either from airborne particles of red dust or from a type of alga that contains a red pigment.

Origin:
1670–80

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Encyclopedia Britannica
Encyclopedia

red snow

snow or ice surfaces, usually overlying soil on mountains, that are coloured by algae such as Chlamydomonas or Raphidonema. During seasons when there is little sunlight and temperatures are below the freezing point, the algae are dormant.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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