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
Extinct language said to be both extinct and dead: inscriptions are ill understood even by the most knowledgeable scholars, and the language ceased to be used in any form long ago, so that there have been no speakers, native or non-native, for many centuries. In contrast, Old English, Old High German and Latin never ceased evolving as living languages, nor did they become totally extinct as Etruscan did. Through time Latin underwent both common and divergent changes in phonology, morphology, syntax and lexicon and continues today as the native language of hundreds of millions of people, renamed as different Romance languages and