NASA Is Tracking One Of Earth’s Most Valuable Resources — Water

Water is a complex problem on Earth: Some places get far too little of it and some get far too much. That’s why NASA and its international partners are tracking the flow of freshwater across the world in hopes of improving access to it for the billions of us who depend on it. Satellites study how water moves through its cycle. Sometimes it evaporates from warm oceans in the tropics, condenses into clouds and then falls back into the ground as snow or rain. The water might stay in a river or lake — or freeze, locked within ice or snow. It can either evaporate into the atmosphere or soak into the ground, moistening the soil or filling an aquifer.