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For years, mysterious 10-feet deep sand holes kept appearing, then disappearing in dunes at a national park in Indiana. After multiple people—including a six-year-old boy—fell in, scientists discovered that the holes were formed when sand-covered trees decayed over time.
A 2016 study by You do not have permission to view the full content of this post. Log in or register now. department of geosciences found that the trees were once covered in fungi that formed a cement-like substance that held its shape even when the tree rotted away. When the cement-like covering and the sand around it eventually gave way, it formed the holes.
A 2016 study by You do not have permission to view the full content of this post. Log in or register now. department of geosciences found that the trees were once covered in fungi that formed a cement-like substance that held its shape even when the tree rotted away. When the cement-like covering and the sand around it eventually gave way, it formed the holes.