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
Active intellect same way that light makes potential colors into actual colors. The passage is often read together with "Metaphysics", Book XII, ch.7-10, where Aristotle also discusses the human mind and distinguishes between the active and passive intellects. In that passage Aristotle appears to equate the active intellect with the "unmoved mover" and God. Sachs comments that the nature of the active intellect was "the source of a massive amount of commentary and of fierce disagreement"; elsewhere, chapter 5 of "De Anima" has been referred to as "the most intensely studied sentences in the history of philosophy". As Davidson remarks: Just what