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
Ogilvy baronets dormant or extinct in 1803, see Lord Banff. The Ogilvy Baronetcy, of Forglen in the County of Banff, was created in the Baronetage of Nova Scotia in 1701. For more information on this creation, which became either dormant or extinct in 1803, see Lord Banff. Ogilvy baronets There have been three baronetcies created for members of the Ogilvy family, all in the Baronetage of Nova Scotia. As of 2008 one creation is extant while two are either extinct or dormant. The Ogilvy Baronetcy, of Inverquharity in the County of Forfar, was created in the Baronetage of Nova Scotia on 29