Grizzly Fumarole

Deep inside the core of the planet pulses a blazing heart that heats the earth and forces the very stones we stand on to simmer and melt in a march from one side of the globe to the other. Along the way, hot gasses force their way through the earth's crust causing a pool of steaming, spewing mud to mount up and become a bubbling bath of grey and brown. A fumarole is an opening in Earth's crust, often in the neighborhood of volcanoes, which emits steam and gases such as carbon dioxide, sulfur dioxide, hydrochloric acid, and hydrogen sulfide. A good example of fumarole activity on Earth is the famous Valley of Ten Thousand Smokes, which was formed during the 1912 eruption of Novarupta in Alaska. Initially, there were thousands of fumaroles in the cooling ash from the eruption, but over time most of them have become extinct. There are also an estimated four thousand fumaroles within the boundaries of Yellowstone National Park, of which Grizzly is one. This sound uses the following file from Freesound: http://www.freesound.org/samplesViewSingle.php?id=103149