TED KINSMAN / SCIENCE PHOTO LIBRARY TED KINSMAN / SCIENCE PHOTO LIBRARY
A lengthwise cross section of an icicle that is three days old. In this case the icicle grows rings similar to a tree. The age of an icicle can be determined by the number of heating and cooling cycles the icicle has gone through. This cross section is 2 mm thick and is photographed in polarized light.
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