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
Dormant Commerce Clause and Clarence Thomas have rejected the notion of a Dormant Commerce Clause. They believe that such a doctrine is inconsistent with an originalist interpretation of the Constitution—so much so that they believe the doctrine is a "judicial fraud". A number of earlier Supreme Court justices also expressed dissatisfaction with the dormant Commerce Clause doctrine. For example, Chief Justice Taney said this in 1847: If it was intended to forbid the States from making any regulations of commerce, it is difficult to account for the omission to prohibit it, when that prohibition has been so carefully and distinctly inserted in relation