Why do the domes (new and old) steam? They steam because there is a large amount of hot rock present and when it combines with the high volume of groundwater in the crater, the heat causes the water to boil – think a boiling kettle. There is also volcanic gases mainly CO2 and some sulphides (these give off the unpleasant smells). The steaming is most prominent at the top of the new dome and at the interface between the old dome and the new because there is now more gaps through which the steam can come through. The fumarolic activty along the old dome will also steam more due to the increased activity within the crater. #volcanooutreach #lasoufrière #svg #uwi #uwiseismic Photo credit (NEMOSVG)