fumaroles's Usage Examples:

These include something like 500 to 600 geysers and thousands of hot springs, mud pots, and fumaroles (vents where steam escapes from underground).

Hydrogen is found in the free state in some volcanic gases, in fumaroles, in the carnallite of the Stassfurt potash mines (H.

Today in the crater many active fumaroles can be observed.

Fine lakes and waterfalls, innumerable pools, in temperature from boiling-point to cold, geysers, solfataras, fumaroles and mud volcanoes still attract tourists in large numbers.

It is of remarkably regular formation, and the floor is pierced by a number of huge fumaroles whence issue immense volumes of steam.

A triple-peaked volcano in the solfatara stage, extinct at the summit, but displaying considerable activity at its base in the form of numerous fumaroles and boiling sulilhur springs.