Which of the following is NOT a source of heavy metal pollution?

Which of the following is NOT a source of heavy metal pollution?
1.atmospheric deposition
2.runoff
3.animal feed lots
4.sewage and industrial discharge
5.mine drainage

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Answer

• animal feed lots
  Explanation:
  Toxic heavy metals such as As, Cd, Cr, Cu, Hg, Pb and Zn, are released mainly in sewage effluents. Ground water exiting abandoned mined have high concentration of heavy metals such as copper, lead, zinc, and mercury. Among the heavy metals in atmospheric deposition is zinc. Animal feed contains minimal heavy metals that can be deposited into animals systems, but contributes less to heavy metal pollution in general.