ace4.org Mud Volcano Area, Yellowstone
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Yellowstone Lake, on a snowy day Iron sulfide in the water causes the grey-black color, and the smell Dragon's Mouth, the water sloshes in and out of the cave, creating a belching sound, as if there is a dragon deeper in the cave


Another muddy pool Boiling mud Snow formations


These snow formations were interesting, and could be found on top of branches, signs, rocks, and even up in trees Black Dragon's Cauldron, was furiously boiling


Fire-damaged area


                


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