Physics
Scientific paper
Feb 1973
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973natur.241..521r&link_type=abstract
Nature, Volume 241, Issue 5391, pp. 521-523 (1973).
Physics
Scientific paper
HAD Professor Lyttleton sent me his letter1 before publication, I would have suggested that he replaced his homely parable with a straightforward account of how his controversy with me has-unhappily-arisen. To judge from his recent review2, from which the quotations I will use are drawn, he has become seriously displeased that his attempts to revive Ramsey's theory3, that the Earth's core is not iron but a phase change undergone by ferromagnesian silicates of the mantle at high pressure, has not ``for some curious reason ... found much favour with geophysicists''. He extended Ramsey's theory by postulating that the pressure at which this hypothetical phase change occurs decreases with increasing temperature. Thus starting with a cold accreted Earth-wholly of silicate with no iron core-the disseminated radioactivity heated the Earth up to the temperature at which the phase change to a denser state began at the centre. Thus the core grew and the Earth's radius contracted.
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