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Science 31 January 1997:
Vol. 275. no. 5300, pp. 614 - 0
DOI: 10.1126/science.275.5300.614
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Research News

Richard A. Kerr

At the bottom of Earth's mantle lies a strange realm, where "continents" may fall from above, fiery bogs stew above the molten core, and whole chunks of landscape can loft upward like so many hot-air balloons.

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