50.5 MB (3.3 MB compressed)
5157 x 3425 pixels
43.7 x 29.0 cm ⏐ 17.2 x 11.4 in (300dpi)
DUNCAN SHAW / SCIENCE PHOTO LIBRARY DUNCAN SHAW / SCIENCE PHOTO LIBRARY
Morning frost. Hoar frost covering willow (Salix sp.) trees (top) and grass (foreground), with common reeds (Phragmites australis) and bulrushes (Typha sp., brown, left) around a small lake. Hoar frost results when heat is lost through radiation into the open sky on cold clear nights, causing objects to become colder than the surrounding air. This temperature difference causes the water in the warmer air to condense on the colder objects and then freeze into small ice crystals. Photographed on the Somerset Levels, England, UK, in December.
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