Hotspots Volcano

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hotspots volcanic areas believed formed mantle plumes, hypothesized columns of hot material rising core-mantle boundary in fixed space causes large-volume melting. because tectonic plates move across them, each volcano becomes dormant , re-formed plate advances on postulated plume. hawaiian islands said have been formed in such manner; has snake river plain, yellowstone caldera being part of north american plate above hot spot. theory, however, has been doubted.








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