Volcanoes are classified as active, dormant, or extinct. If they have erupted during the last 50 years,

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Volcanoes are classified as active, dormant, or extinct. If they have erupted during the last 50 years, they are clearly classified as active. On what bases are dormant or extinct volcanoes classified, and how can geologists be sure an extinct or dormant volcano may not suddenly become active?
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Managerial Economics

ISBN: 978-0133020267

7th edition

Authors: Paul Keat, Philip K Young, Steve Erfle

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