A Lively or Stagnant Lowermost Mantle?

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Science  04 May 2001:
Vol. 292, Issue 5518, pp. 841
DOI: 10.1126/science.292.5518.841

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Geophysicists are debating whether the deep Earth shapes the surface like a quiescent lava lamp on low or like one churning up abundant blobs. Recently, one group of geophysicists thought they saw signs of a stagnant lowermost mantle--a lava lamp on low. Now, another group instead sees signs of a fired-up lava lamp.