Geophysics: Cooler at the Core

Though scientists are solving more and more of the mysteries in the sky above, they still know surprisingly few of the secrets hidden in the earth be low. But now, combining sharp observation and shrewd reasoning, U.C.L.A.

Professor George Kennedy has cut in half previous estimates of the tempera ture of the earth's core. His cool calculations promise new insight into both the current structure of the earth and ancient geologic activity.

In determining melting points of iron (and all other substances that increase in volume as they melt), scientists have long used Lindemann's Law, a complicated mathematical formula describing the...

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