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| | Water - Wikipedia, the free encyclopedia |
 | | This reversal will cause deep water to remain warmer than shallower freezing water, so that ice in a body of water will form first at the surface and progress downward, while the majority of the water underneath will hold a constant 4 °C. This effectively insulates a lake floor from the cold. |
 | | Water quality, however, remains a huge problem, with high levels of arsenic and untreated sewage in the river water. |
 | | The Guaraní Aquifer, located between the Mercosur countries of Argentina, Brazil, Bolivia and Paraguay, with a volume of about 40000 km³, is an important source of fresh, drinkable water, for all four countries. |
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