Frost covers a field of thistles. Frost is similar to dew, but forms at temperatures below freezing. Water vapor is transformed directly into ice crystals without ever taking the form of water droplets. This process is called sublimation.
Thistles with frost (DI02396)
2007-02-22
University Corporation for Atmospheric Research (UCAR)
image
Nature
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DI02396
http://n2t.net/ark:/85065/d74b2zgf
