What is solfatara?

A solfatara is a type of volcanic vent that emits sulfur gases, primarily sulfur dioxide, along with steam and other volcanic gases. It is typically found in areas with geothermal activity, where the ground temperature is elevated. The sulfur gases can lead to the formation of yellowish sulfur deposits around the vent. Solfataras are often associated with fumaroles and are common in volcanic regions, such as Italy and parts of Japan.