Finally, channels carved by volcanic lava flows through thermal erosion use the term vallis or the plural valles. Small shield volcanoes use the term tholus or the plural tholi, e.g. The term has also become the generic term for referring to these structures. Volcanic depressions use the term patera or the plural paterae, e.g. Lava flows use the descriptive term fluctus or the plural fluctūs, e.g. Volcanoes that were first observed as an active feature from observations of a volcanic plume fit under the category of "Eruptive Center" and do not use a descriptive term, though portions of these features may have also received names that do use a descriptive term, like Prometheus Patera or Masubi Fluctus. The descriptive term used is based on the type of feature named and how it was first discovered. The names of volcanic features on Io use a combination of a name derived from mythological figures from around the world related to the Sun, fire, volcanoes, thunder, or smithing, places from the Greek mythological story of Io, Dante's Inferno, or from the name of a nearby feature on Io's surface and an approved descriptive term. The features listed below represent a subset of the total known volcanic features on Io's surface with the majority currently not having an officially approved name. ![]() These names have been approved for use by the International Astronomical Union. ![]() This is a list of named volcanic surface features on Jupiter's moon Io. Portions of Tohil Patera to the lower right. Culann Patera (greenish features above center) with associated lava flows and red volcanic plume deposits.
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