Question

Which of the following is/are the possible consequence/s of heavy sand mining in riverbeds ?

Decreased salinity in the river
Pollution of groundwater
Lowering of the water-table
Select the correct answer using the code given below :

(a) 1 only

(b) 2 and 3 only

(c) 1 and 3 only

(d) 1, 2 and 3

Answer 1

Hello user myself is Rahul and I am a student of class 10th.


in the above question which you ask that decreasing plenty in the river pollution of groundwater lowering of the water of the water table table it is so much of maintained of the population and the elaboration of water it may be the causing of water level down in the earth.

Answer 2

The possible consequences of heavy sand mining in riverbeds are pollution of groundwater and the lowering of the water table.  

Option B.

Explanation:  

• The sand removal from the river bed results in increasing the 'velocity of the 'flowing water' which eventually leads to distorted flow-regime and of eroding of the river banks.
• 'Depletion of sand' in the 'stream bed' causes the 'deepening of rivers' and estuaries, and the 'enlargement of river mouths' and coastal inlets.
• It leads to 'saline-water intrusion'. The sand acts as an 'efficient filter' for 'various pollutants' and thus maintains the 'quality of water' in rivers and 'other aquatic ecosystems'.

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