hot spring, also called thermal spring, spring with water at temperatures substantially higher than the air temperature of the surrounding region.
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Within the Park, there are 3 places where you can touch the thermal water. Even though the water comes out of the ground at 147 degrees F, it is cool enough to touch by the time it reaches the pools.
Hot-spring water is usually fairly safe from the standpoint of carrying disease-causing organisms, but some is not (see below under Stay healthy), and the surface water that cools a scalding spring to usable temperatures will be prone to the same bugs and pathogens as any other surface water.
One of the places most famous for its hot springs is Japan. There are more than 3000 of these springs, called “onsen,” scattered across the country - which is more than anywhere else on earth, according to Lonely Planet.
Over the years, Hot Springs became famous for its therapeutic benefits. The area attracted more visitors and developed into a well-known resort nicknamed “The American Spa” because it attracted not only the wealthy but also health seekers from around the world.
Microbial mats of heat-loving archaea (single-celled, bacteria-like organisms) cling to the edges, with different species congregating at different temperatures and forming the spring's outer rainbow hues. It's too hot for these tiny guys toward the center, leading to the rich, sterile blue tones found there.
Hot Spring Colors - Old Faithful Virtual Visitor Center. Many of the bright colors found in Yellowstone's hydrothermal basins come from “thermophiles” — microorganisms that thrive in hot temperatures. So many individual microorganisms are grouped together—trillions! —that they appear as masses of color.
Grand Prismatic Spring—Wyoming, USALocated in Yellowstone National Park, the Grand Prismatic Spring is the third-largest hot spring in the world. Its mesmerizing colors of orange, yellow, green, and blue are only one of its crowd-drawing attributes.
A quick history crash courseDogo is officially the oldest hot spring in Japan – its history stretches back an astonishing 3,000 years. According to the onsen legend, its soothing waters once healed the illnesses of one of the area's main deities in ancient times.