Profiles the systems that work together to keep urban areas running safely, discussing how cities have evolved since the first riverside settlements while outlining projects that explain facts about transportation, water systems, and architecture.

Presents twenty-five projects that explore the Ice Age, including the construction of mini glaciers, recreation of Ice Age etchings, and taking core samples.

Where does garbage go? How does it break down? What are the challenges of dealing with so much waste? What can we do decrease the amount of stuff we are throwing away? Garbage explores questions like these while encouraging kids to think about the choices they make that generate garbage in the first place. In this book, kids discover the science of garbology, the fascinating world of midden excavation, and learn about different rubbish warriors who...