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What's the difference between an active, dormant and extinct volcano?

Live Science
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78% Informative

A volcano that hasn't erupted in the Holocene Epoch is considered extinct.

An even fuzzier term is "dormant" Volcanoes may go quiet for centuries , only to rumble to life with devastating eruptions.

There is a physical reason to consider a volcano extinct after it's been quiet for 11,000 years .