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In this Thursday, November 21, 2013 photo, people gather around a huge sinkhole in the village of Sanica, Bosnia. Only weeks ago, the spot was a pond full of fish and floating green algae, lined with old willow and plum trees, and a grass field where cattle used to peacefully graze. The vanishing pond was some 20-meters in diameter and about 10-meters deep. Now, the "abyss" as the villagers named the dry sinkhole, is some 50-meters wide and 30-meters deep. Scientists say it is not an uncommon occurrence that ponds and small lakes disappear. They say it could be caused by drying underground waters, or changes in soil drainage due to agricultural irrigation. (Photo by Amel Emric/AP Photo)
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