The area around the Geysers in Yellowstone National Park are some of the most interesting features of the park. When the hot water makes its way through the rock layers to erupt as a geyser, it picks up a variety of minerals. As the water cools, those minerals are deposited on the area surrounding the geyser. Because the temperature of the water takes time to drop to the ambient temperature, bacteria and algae begin to grow right at up the the heat threshold. I am always fascinated by the details of the world around me.
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