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Icicles cling to the ceiling and walls of limestone in the Texsa HIll Country's Westcave Preserve. These blocks of ice form when...
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Ice at Westcave Preserve 3

Westcave Preserve

Icicles cling to the ceiling and walls of limestone in the Texsa HIll Country's Westcave Preserve. These blocks of ice form when the temperatures drop into the 20s for an extended period of time (in the teens in this instance). But the morning sunlight quickly melts the beautiful and rare structures. Photo © copyright by Rob Greebon.