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China's arsenic contamination risk is assessed
http://www.bbc.co.uk/news/science-environment-23794644
Exposure to contaminated drinking water can cause serious health problems
Nearly 20 million people in China could be exposed to water contaminated with arsenic, a study suggests.
Scientists used information about the geology of the country to predict the areas most likely to be affected by the poison.
The report is published in the journal Science.
Arsenic occurs naturally in the Earth's crust, but if it leaches into groundwater, long-term exposure can cause serious health risks.
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