Forest rings. The origin of forest rings is not known, despite several mechanisms for their creation having been proposed. Such hypotheses…

Forest rings. The origin of forest rings is not known, despite several mechanisms for their creation having been proposed. Such hypotheses include radially growing fungus, buried kimberlite pipes, trapped gas pockets, and meteorite impact craters.

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Source: List of unsolved problems in biology (CC BY-SA 4.0)