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Letters to Nature
Nature 174, 505 (11 September 1954); doi:10.1038/174505a0

Composition of the Earth's Outer Core

K. E. BULLEN

Dominion Observatory, Ottawa, and University of Sydney. July 31.

ATTENTION has lately been given to the following set of four postulates: (a) the Earth, Mars and Venus have a common primitive composition; (b) compressibility is essentially a smoothly varying function of pressure at pressures beyond 0.4 × 106 million atmospheres in all three planets; (c) the outer core of the Earth is a high-pressure modification of ultrabasic rock; (d) each planet has an inner core chemically distinct from the matter in the outer core.

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  4. Bullen, K. E. , "Seismology" (Methuen, 1953).
  5. Woolard, E. W. , Astron. J., 51, 33 (1944). | Article |
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  8. Jeffreys, H. , Mon. Not. Roy. Astro. Soc., Geophys. Supp., 4, 62 (1937).
  9. Bullen, K. E. , Nature, 170, 363 (1952). | ISI |



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