Discussion
The average electrical conductivity of the Earth is about :
Answer: C
The key gives about \(10^{-3}\) S/m.
The conductivity of the Earth's surface materials varies widely, from about 4 S/m in sea water to less than \(10^{-4}\) S/m in dry crystalline rock. For average ground, the value used in radio-wave propagation and in many geophysics texts is of the order of \(10^{-3}\) S/m (resistivity of about 1000 ohm-m).
Values of 10 and 1 S/m are typical of sea water and highly saline material, not of the Earth on average, and \(10^{-9}\) S/m is close to an insulator such as dry quartz or the atmosphere.
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