Old Faithful, faithfully performed for us and a small crowd first thing in the morning.
Spectrum Hot Spring Pool was my favorite because of it's many brilliant colors: blue, green, yellow, and red copper.
Geysers, hot springs, and steam vents are a little disconcerting to see, at first, because you know that hot molten rock deep under the surface you are standing on is the source of all that heat and sulfurous odors. (The majority of them don't have that rotten eggs smell.) The US Geologic Agency has scientific equipment throughout the park to measure earth tremors and bulges in the earth's surface. If the place wasn't so beautiful I wouldn't visit such a place. After all, Yellowstone is still considered an active volcanic region, and we slept in a lodge that sits inside the ancient volcano's caldera.
This bubbling hot spring also had a steam vent that made a howling noise.
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