Question
Which of the following is/are the possible consequence/s of heavy sand mining in riverbeds ?
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 :
(a) 1 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1 ,2 and 3
Answer:
B
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Explanation:
Heavy sand mining in riverbeds can have detrimental consequences on the environment and water resources. The possible consequences include:
1. Pollution of groundwater: Sand mining can disrupt the natural flow of water, leading to changes in groundwater levels and contamination of groundwater sources. The excavation and disturbance of riverbeds can introduce pollutants and sediments into the groundwater, affecting its quality.
2. Lowering of the water table: Sand mining involves the extraction of sand from riverbeds, which can lead to the lowering of the water table. Removing large amounts of sand can reduce the storage capacity of the riverbed, impacting the availability of water and affecting the overall hydrological balance.
Decreased salinity in the river is not a direct consequence of sand mining. Salinity levels in rivers are influenced by various factors, including the influx of seawater, rainfall, and geological characteristics, rather than sand mining alone.