Sends the reader on a fact-finding mission, posing an initial challenge and concluding with questions and answers, while learning about ways to care for our planet.
Chronicles the history of mankind's study and use of hydrogen and describes the creation of new vehicles that use hydrogen or fuel cells. Examines the potential for these vehicles to cut down on carbon dioxide emissions and considers how long it will take for these types of vehicles to become the norm.
An introduction to North America, including the amazing rivers, waterfalls, and mountain ranges, as well as one of the modern marvels of North America.
