From big pieces of garbage to invisible chemicals, ____ wide range of pollutants ends up in our planet's lakes, rivers, streams, groundwater, and eventually the oceans. ____Water pollution—along with drought, inefficiency, and ____ exploding population—has contributed to a freshwater crisis, threatening ____ sources we rely on for drinking water and other critical needs. Located in Nelson Lakes National Park, Blue Lake—also known as Rotomairewhenua—holds the title of the world’s clearest lake. Scientific tests carried out in 2011 by New Zealand’s National Institute of Water and Atmospheric Research (NIWA) showed Blue Lake to be ____ clearest natural body of fresh water known to man. According to ____ research results, visibility in the lake is up to 80 metres (262 ft) – meaning the water is considered almost as “optically clear” as distilled water. According to a report by the Worldwatch Institute on nuclear waste, Karachay Lake is ____ most polluted open-air place on Earth from ____ radiological point of view. The lake accumulated some radioactivity over less than one square mile of water. For comparison, the Chernobyl disaster released a much smaller amount. The sediment of the lake bed is estimated to be composed almost entirely of ____ high level radioactive waste deposits to a depth of roughly 3.4 metres.

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