Image:Snow crystals.png

Snow flakes highly magnified by a low-temperature scanning electron microscope (SEM).
The colours are called "pseudo colours", they are computer generated and are a standard technique used with SEM images.

• Source: http://emu.arsusda.gov/snowsite/

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This image is in the public domain because it contains materials that originally came from the Agricultural Research Service, the research agency of the United States Department of Agriculture.