Explanations:Groundwater contamination is a significant environmental issue in India, particularly in states like Rajasthan, Maharashtra, West Bengal, and Bihar. The over-extraction of groundwater can lead to increased concentrations of naturally occurring contaminants such as fluoride and arsenic, posing serious health risks to the population.
Fluoride is a naturally occurring element found in rocks and soil. When groundwater is over-extracted, it can lead to increased concentrations of fluoride in the water. This is a common issue in Rajasthan and Maharashtra, where the geology of the region contains high levels of fluoride. Over-extraction of groundwater can cause the water table to drop, leading to increased contact with fluoride-rich rocks and soil, which in turn increases the fluoride concentration in the water. High levels of fluoride in drinking water can lead to a condition known as fluorosis, which affects the teeth and bones.
Similarly, arsenic is another naturally occurring element found in rocks and soil. In parts of West Bengal and Bihar, the geology of the region contains high levels of arsenic. Over-extraction of groundwater can lead to increased concentrations of arsenic in the water. This is a serious issue because arsenic is a toxic element that can cause a range of health problems, including skin lesions, cancer, and cardiovascular disease. The increased concentration of arsenic in groundwater is a result of the over-extraction of water, which leads to increased contact with arsenic-rich rocks and soil.
Therefore, both statements are correct. Over-extraction of groundwater has led to increased fluoride concentration in Rajasthan and Maharashtra, and increased arsenic concentration in parts of West Bengal and Bihar. This highlights the importance of sustainable groundwater management practices to prevent the contamination of groundwater and protect public health.