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| the scientific study and processes and forces involved in the inorganic evolution of the earth |
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| continental crust thickness |
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| spherical mass composed largely of metallic iron with some nickel, sulfur, silicon, and other elements |
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| thick shell of dense rocky material that surrounds the core |
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| thin outer shell of rocky material that is less dense than the rocks of the mantle below |
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first calculation of the radius of the Earth was carried out by this Greek Astronomer in 230 BC
6207 km |
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| radius of earth calculates using 20th century technology |
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| percentage volume of Earth by crust, mantle, and core |
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| occurs because the density of a fluid is related to its temperature. Hot rocks lower in the mantle are less dense than their cooler counterparts above. The hot rock rises and the cooler rock sinks due to gravity |
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| introduced by james in 1795 |
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