Here is a video showing some of Yellowstone's geysers and hot springs. The Earth's crust is super thin at Yellowstone and the Earth's natural geothermal heat causes these geysers and hot springs to form. There are tons of areas in the park where these thermal vents occur and many of them are easily accessible and quite beautiful (although stinky. Sulfur= rotten eggs). Certain species of bacteria are able to live in the super heated water, but only in the "cooler" pools. In the video you will be able to see that the bacterial mats are found on the very edges of pools or in the small run-off streams away from the direct heat source. Check out the video. If you don't give a damn about geology... well then just skip it! Also, check out the latest issue of the National Geographic for a more in depth look at Yellowstone's geologic anomalies.
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