Word: structureâ
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Dates: during 1925-1925
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...year old President, a Cambridge mathematics man of great note, put matters in motion with a resume of the modern description of Earth's age and structure. Age?"definitely between one and 10 billion years" as estimated by timing the decomposition of uranium and other radioactive elements. Structure???a hades-hot metallic core, rigid as steel; then an envelope of viscous material, kept fluid by enormous pressure, not heat conducting, having faint tides, upon which the earth's ,crust "floats". The elasticity of the envelope which is 60 miles beneath the crust, and the core's rigidity, had been deduced...
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