Active volcanic features

Orifices in volcanic areas emitting hot or cold gases and vapours. Their very extreme environment is colonized by highly distinct communities with few species. Included are steam vents (fumaroles), vapour and hot sulphurous gas vents (solfatares), paint pots, porridge pots and mud volcanoes, as well as cold carbon dioxide, methane and nitrogen vents (mofettes), that emit directly into the open atmosphere. Excludes marine (A6.9) and subterranean (H1.4) vents.