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Science 12 October 2001:
Vol. 294. no. 5541, p. 313
DOI: 10.1126/science.1065715
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Perspectives

GEOPHYSICS:
Peeling Back the Layers in Earth's Mantle

John E. Vidale

Seismic studies are providing ever more detailed information about the structure of Earth's mantle. But as Vidale explains in his Perspective, knowledge of the mantle is still patchy and new data can provide surprises. He discusses the results of Deuss and Woodhouse, who have studied a weak boundary in the mantle. The new results help to constrain the temperature and composition in a difficult-to-study depth range but do not match expectations from other geophysical models, possibly leading to new insights.

The author is in the Department of Earth and Space Sciences, University of California, Los Angeles, CA 90095, USA. E-mail: vidale{at}moho.ess.ucla.edu

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Science. ISSN 0036-8075 (print), 1095-9203 (online)