Mud pots and mud volcanoes also generally don’t emit much water, but this one is extremely vigorous, producing somewhere around 40,000 gallons of water a day. Lynch and other experts have taken ...

Put all that together, and you might get a little mud pot. We recorded these mud pots near the Salton Sea in Southern California. Each pot's got its own particular personality. (SOUNDBITE OF BUBBLING) ...

The mud pot’s bubbles, in fact, are caused not by hot water, but by carbon dioxide welling up from underground. “The carbon dioxide is probably being formed as a result of the geologic ...

Yellowstone is home to the world's largest and most densely packed collection of thermal features, with more than 10,000 geysers, hot springs, mud pots and steam vents spewing water, mud and gas.