Abstract
A brief descriptions of natural geoelectric currents emancipating from earth's core, induced by ionospheric currents, magnetic crochets, magnetic storms, tidal movements and local earth currents due to spontaneous polarisation, junction potential, membrane potential, streaming potential, differential temperature cell action and lightning discharge have been given and the order of the currents due to these causes has been evaluated. The order indicates that the local earth currents due to physico-chemical causes in the earth may significantly add to the corrodibility of metals due to the physico-chemical nature of the soil. Longline telegraph cables may sometimes be damaged by corrosion due to the current induced by magnetic storms. The effect of all other geoelectric currents on the corrodibility of metals in soil is insignificant.
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