Volcano of classifying magmatic volcanoes is by their frequency of eruption, with those that erupt regularly called active, those that have erupted in historical times but are now quiet called dormant or inactive, and those that have not erupted in historical times called extinct. However, these popular classifications—extinct in particular—are practically meaningless to scientists. They use classifications which refer to a particular volcano's formative and eruptive processes and resulting shapes. There is no consensus among volcanologists on how to define an "active" volcano. The lifespan of a volcano can vary from months to several million years, making such a distinction sometimes
Gordon baronets of Invergordon "baronetcy dormant 1850" "baronetcy extinct 1831" "baronetcy extinct 1876" Gordon baronets There have been eleven Gordon Baronetcies : The creation of Robert Gordon of Gordonstoun, 4th son of the Alexander Gordon, 12th Earl of Sutherland, to the Baronetage of Nova Scotia was the first such in that Baronetage, and until the line failed in 1908 were the premier baronets in Scotland. "baronetcy dormant 24 Mar 1908" "baronetcy dormant c 1668" "baronetcy dormant 9 Nov 1839" "Baronetcy merged with Viscountcy until it became dormant in 1847" "Baronetcy extinct or dormant 9 Sep 1956" "see Marquess of Aberdeen and Temair"