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3EarthChemistry - Ea11710 Lecture 3 Chemistry of Earth...

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Ea11710 Lecture 3: Chemistry of Earth materials The Earth’s chemistry is roughly Chondrite. Homogeneous (HOT or COLD) debatable. There was a significant amount of heat in the beginning however from: 1. Kinetic energy from incoming planetismals 2. Gravitational collapse 3. Radioactive heating (U, Th, 40K) What was the effect of this heating? Earth is made up roughly of 10% metal and extra iron. In the early stages the Earths temperature was likely to have been hot enough to melt the iron. The melting point of iron is 1535 o C If accretion had been cold then no volatile elements will have been lost. Therefore Sulphur. Sulphur acts as a flux and can lower the melting points of metals such as iron. The molten iron would sink and be drawn towards the centre of the Earth due to irons greater density towards the surrounding material: Iron 7860 kgm -3 Olivine 3300 Kgm -3 The molten iron aggregates as drops and is drawn into the earth.
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