biography
| name: |
Birch, (Albert) Francis
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| sex:
| male
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| lived:
| (1903– )
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| biography:
| Geophysicist, born in Washington, District of Columbia, USA. His studies of the elasticity of rocks and minerals at high pressures and temperatures contributed extensively to knowledge of the composition of the earth. His proposal (1940) that the earth's innermost core is not liquid, but consists mainly of solid crystalline iron, was confirmed in 1971. He became emeritus professor of geology at Harvard University (1974). |
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