Submitted by György Chityil ... on Fri, 01/19/2018 - 23:31 Hierarchy: NounDescription: {{geology}} An upwelling of abnormally hot rock within the Earth's mantle.Ngram: mantle plumeNgram Text: mantle plumeSource: WiktionaryIssue: 0Wiktionary tag: geologyNgram Count: 2