But after a few brittle steps he broke through a layer of burnt-yellow crust and fell into a solfatara, a cauldron of bubbling mud.    From Wordnik.com.  [Richard Bangs: Climbing the Killer Prince -- Merapi Volcano of Java, Part 1] Reference

In the center of the depression are the Sulphur Springs, a geothermal field or solfatara with sulphurous fumaroles and hot springs surrounded by a variety of other volcanic features: explosion craters, lava flows and deposits of pumice and ash.    From Wordnik.com.  [Pitons Management Area, Saint Lucia] Reference

Native sulphur deposits in the solfatara and sulphur extraction in the bottom of the green crater.    From Wordnik.com.  [WN.com - Photown News] Reference

Hence we may conclude what must be the heat in this solfatara at the depth of thirty or forty fathoms.    From Wordnik.com.  [Personal Narrative of Travels to the Equinoctial Regions of America, During the Year 1799-1804 — Volume 1] Reference

Its present state is that of a solfatara; and it is rather an object of curious investigation, than of imposing aspect.    From Wordnik.com.  [Personal Narrative of Travels to the Equinoctial Regions of America, During the Year 1799-1804 — Volume 1] Reference

Montserrat, a solfatara; fine porphyritic lavas with large crystals of feldspar and hornblende near Galloway, according to Mr. Nugent.    From Wordnik.com.  [Personal Narrative of Travels to the Equinoctial Regions of America, During the Year 1799-1804 — Volume 1] Reference

Montserrat, a solfatara; fine porphyritic lavas with large crystals of feldspar and hornblende near Galloway, according to Mr.Nugent. —.    From Wordnik.com.  [Travels to the Equinoctial Regions of America] Reference

St. Lucia, a very active solfatara, named Oualibou, two or three hundred toises high; jets of hot water, by which small basins are periodically filled.    From Wordnik.com.  [Personal Narrative of Travels to the Equinoctial Regions of America, During the Year 1799-1804 — Volume 1] Reference

St. Lucia, a very active solfatara, named Oualibou, two or three hundred toises high; jets of hot water, by which small basins are periodically filled. —.    From Wordnik.com.  [Travels to the Equinoctial Regions of America] Reference

The peninsula’s vegetation is 90% undisturbed and grades with altitude from warm coastal conditions with broadleaf forest with species of southern origin to a cool coast across a 1,660 m altitudinal range containing at least 5 vegetation types, plus a solfatara plant community on the active volcano.    From Wordnik.com.  [Shiretoko, Japan] Reference

Nevis, a solfatara. —.    From Wordnik.com.  [Travels to the Equinoctial Regions of America] Reference

St. Christopher's, a solfatara at.    From Wordnik.com.  [Personal Narrative of Travels to the Equinoctial Regions of America, During the Year 1799-1804 — Volume 1] Reference

Nevis, a solfatara.    From Wordnik.com.  [Personal Narrative of Travels to the Equinoctial Regions of America, During the Year 1799-1804 — Volume 1] Reference

St. Christopher’s, a solfatara at Mount.    From Wordnik.com.  [Travels to the Equinoctial Regions of America] Reference