An essential tool to teach kids about the importance of water! Did you know that when water appears in your home, it must disappear from somewhere else? And that freshwater supply has to be shared by 7.7 billion people on Earth? If people do not conserve freshwater, there will not be enough for everyone. The good news is that there are lots of ways you can help save water. Learn all about them in How You Can Save Water. ABOUT THIS SERIES: Earth...