作者：Robert E. Wells
插画：Robert E. Wells
On a hot day, nothing tastes better than a glass of cold water. But did you know that the water you drink is really very old? Some of the water molecules you just swallowed might have been in the water hole that a dinosaur drank from millions of years ago! Water is one of our most important natural resources. Discover where it comes from, where it’s been, and where it’s going—it’s all part of the amazing water cycle.