The colors are produced by microorganisms that live in the hot water that the caldera produces. Each of the microorganisms have a specific heat they can live in, so you can see where the heat of the water changes the closer it gets to the surface by the different colors of the microorganisms. The Yellowstone Caldera is also home to many geysers. One of the more popular geysers is Old Faithful. This geyser isn't located inside of the caldera, but it erupts because of the heat which the caldera generates. This caldera is a benefit to the areas that encircle it because of the many tourists it attracts. The caldera produces many of the things that you would want to see if you go to Yellowstone national park. Without the caldera, you wouldn't have mud pots, hot springs, geysers, or the beautifully colored pools that are all main features that make Yellowstone a key place to see. So when people flock to see all these natural wonders, they are bringing their business to the people who live there. This allows people who live there to have their own small businesses or tourist attractions which are funded off