Q81.
Which of the following is/are the possible consequence/s of heavy sand mining in river beds? 1. Decreased salinity in the river 2. Pollution of groundwater 3. Lowering of the water-table Select the correct answer using the code given below:
Answer
B
Explanation
Sand mining may lead to saline-water intrusion from the nearby sea (so salinity INCREASES, not decreases - statement 1 is incorrect). Sand mining affects the adjoining groundwater system (statement 2 correct). Sand aquifer helps in recharging the water table and sand mining causes sinking of water tables in nearby areas (statement 3 correct). Hence 2 and 3 only are correct.