An oak leaf leaves an impression in the ice covering a small pond in Snohomish County, Washington. The leaf fell on the pond after it froze and protected the ice immediately beneath it from sublimation, a natural process where ice transitions into vapor without turning to liquid first. This is the same process that causes a snow on a field to vanish during a prolonged cold spell. Reflections of trees surrounding the pond are visible around the edges of the leaf impression.
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