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UPSC Prelims 2018 · World Geography · Countries, Rivers and Resources
Which of the following is/are the possible consequence/s of heavy sand mining in riverbeds? Select the correct answer using the code given below:
- Decreased salinity in the river
- Pollution of groundwater
- Lowering of the water-table
- (a) 1 only
- (b) 2 and 3 only
- (c) 1 and 3 only
- (d) 1, 2 and 3
Show the answer and explanation
Answer: (b) 2 and 3 only
Groundwater pollution and a lower water table are real effects.
Statement by statement
1. ✗ NO Sand mining tends to INCREASE salinity (seawater pushes in at river mouths).
2. ✓ YES Removing sand exposes aquifers to pollution.
3. ✓ YES Deeper riverbeds lower the water table.
Why the others are wrong
(a) Accepts decreased salinity.
(c) Accepts decreased salinity.
(d) Accepts decreased salinity.
The trap
Statement 1 reverses the effect.
🔒 Sand mining: riverbed lowering, bank erosion, saltwater intrusion.
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