A Project Guide to Earth's Waters

Book excerpt: How do clouds form, and where does water go after it rains? What makes water stick to things, and does this characteristic serve any purpose? What effect does pollution have on the quality of water—for humans and other living things? Can salt water be made drinkable? Is it possible to change aspects of water such as its freezing point or density? Using simple and fun hands-on experiments, you can answer all of these questions and more as you learn about the substance that makes life possible on Earth—water.