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4.2.1 Natural Sources

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Natural sources like geothermal and volcanic activity and rock weathering are some natural sources known to play their part in contamination of water sources. Rainwater is also a common source of water contamination as it dissolves air pollutants and transports them in groundwater, as is the case in acid rain. Moreover, the rock oxidation, sea intrusion, decay of radioisotopes (uranium‐enriched bedrock), and surrounding vegetation add on to these contaminants in water sources. Rock oxidation and rock weathering are also some natural activities that are major causes of heavy metal pollution (Talabi and Kayode 2019).

Groundwater Geochemistry

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