| It is composed of andesitic lavas of the augite type, is pierced by many fumaroles, and has a crater in the solfatara stage. |
| Hydrogen sulfide and steam belch from these fumaroles or solfataras located on the floor of Hawaii's Kilauea Caldera. |
| Hydrogen sulfide, one of the typical gases issuing from fumaroles, readily oxidizes to sulfuric acid and native sulfur. |
| The banks on both sides of the river are marked by innumerable steam jets, ngawhas, fumaroles, and geysers. |
| It was preserved because of its amazing hot springs, fumaroles and geysers. |
| Surface geothermal manifestations include hot steaming ground, fumaroles, mud pools, and warm to boiling hot springs. |
