Boiling lake in <a href="https://en.wikipedia.org/wiki/Yellowstone_National_Park" class="extiw" title="w:Yellowstone National Park">Yellowstone National Park</a>.Once Churning Caldron was a cool spring covered with colorful mats of microorganisms. This all has changed after earthquakes in 1978-79 superheated the water and killed the microbes. This once cool pool now averages 164°F and in 1996, it began throwing water 3-5 feet.
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<span class="int-own-work" lang="en">Own work</span>