Arsenic concentration has been on an increase in the ground water of certain areas in Bihar and West Bengal due to:1. acid rain2. excessive pumping of ground water3. industrial pollution4. leaching of agricultural landThe correct causes may be:

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Arsenic concentration has been on an increase in the ground water of certain areas in Bihar and West Bengal due to:<br>1. acid rain<br>2. excessive pumping of ground water<br>3. industrial pollution<br>4. leaching of agricultural land<br>The correct causes may be:






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