Fumaroles: Volcanic Steam Vents

A fumarole is a vent that emits hot volcanic gases without liquids.

Fumaroles emit volcanic gases like sulfur oxides and hydrogen sulfide.

Fumaroles that emit sulfur compounds are called solfataras.

Fumaroles mainly form in the final stages of volcanic activity.

Changes in fumarole gases can help predict volcanic eruptions.

Temperatures of fumarole gases range from 100 to 1,000 degrees Celsius.

Fumaroles appear along cracks, fissures, and on lava flow surfaces.

Some fumaroles last decades or even centuries if heat persists.

Yellowstone still hosts active fumaroles 70,000 years after eruption.

Fumarole gases break down rock and create colorful mineral deposits.

Sulfur crystals at fumaroles can grow up to 2 centimeters long.

Fumaroles emit steam formed by groundwater heated by hot rock.