Anemone Geyser is actually two closely related geysers. The larger of the two is known as Big Anemone while the smaller is known as Little Anemone. The two geysers were named after the anemone flower,both vents have a pale yellow color and shape similar to the flower.
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Heart Spring is a pretty pool of clear blue water, 15 feet deep and 10 feet across, enclosed by white sinter mats and orange-brown algae. The pool is generally inactive, its water temperature a little below boiling.
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The Castle Geyser is located in the Upper Geyser Basin of Yellowstone National Park. Its cone is large and it is estimated to be more than 1000 years old . During that period it has grown due to the deposition of geyserite sinter brought up by each eruption.
Like most geysers, Castle has a "circle of destruction" around it where most plant life has been killed by the heat, acidity and sulfurous compounds. The tree in the foreground is a typical example.
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