Are you an expert on water or could you stand to learn more? For instance, how much of Earth’s water is fresh? How much fresh water do clouds hold? How many people in India have been displaced by large-scale dams?

Check out National Geographic’s “Freshwater 101” quiz to test your smarts (and to learn how much water it takes to make blue jeans. Hint: It’s a lot!)

World map with water on white backdrop