Provides a simple introduction to the use of levers, pulleys, and wheels to move heavy objects.

A blue whale is big; its the biggest animal alive. But it isn't the biggest thing there is. In this informative and engaging book, readers discover some big things, some bigger things, and the thing beyond measure--what can truly be called the Biggest Thing There Is!

TThe author explains the complete water cycle and also discusses ocean currents, ocean and lake habitats, and hydroelectricity. He also touches on water pollution and our responsibility to keep our water clean.