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INDO GANGETIC PLAINS AND WATER CONTAMINATION

- More than 100 million people around the world today are exposed to dangerously high levels of naturally-occurring groundwater arsenic in sedimentary aquifers. However, the ultimate source of this stubborn bulk-arsenic in these aquifer sediments is unknown. 

- Taking a stab at answering why arsenic occurs in groundwater at some places on Earth but not others, researchers in India, Sweden, the United States, France and Australia found that major swathes of groundwater arsenic-polluted areas across the world are mostly located in basins that run parallel to mountain ranges along convergent tectonic plate boundaries.

- For Asia, this basin adjacent to the Himalayas is the Indo-Gangetic plain, spanning India, Nepal, Pakistan, Bhutan and Bangladesh. This plain is one of the most densely populated regions in the world.

- Mukherjee pointed out that such global-scale pattern of arsenic presence in groundwater can’t be a sheer coincidence and must be related to some processes inherent to the planet’s evolution, which we are yet to understand. This thread of reasoning led the researchers to propose the hypothesis of connectivity between global tectonic upheavals and locally reported groundwater pollution of arsenic.

https://scroll.in/article/930607/tectonic-upheavals-under-earths-surface-could-be-a-cause-of-arcenic-contamination-in-groundwater

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