Jan 24, 2020, 15:34 by kevin.b.ke...@gmail.com: > On Fri, Jan 24, 2020 at 8:40 AM Christoph Hormann <o...@imagico.de> wrote: > >> Reason for the lack of verifiability is that what an active volcano is >> in almost all uses of this term does not depend on the current state of >> the volcano but on its history - most commonly during the holocene (10k >> years) or during historic times. >> > > That's often entirely verifiable by the existence of human artefacts > damaged by a previous eruption. > But it is not verifiable in practice by amateur surveyors. Similarly frequency of a road in cars/hour is not a practically verifiable quantity, since determining it would require long-term observations which are not realistic for mappers to do.
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