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Freshwater makes up just a tiny percent of the water on Earth. Yet we depend on it for everything from growing food to manufacturing to everyday uses at home. The averge American uses 340 liters (90 gallons) per day.
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Rain is just one part of the planet’s water cycle.
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NASA
The Arctic Ocean didn’t become salty until a stretch of land that ran from Greenland (pictured here) to Scotland sank far enough beneath the sea, a new study finds.
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