These comprehensive books take students on a journey through the diversity of our world. Topics range from interesting animals to cultural and natural world studies. Readers will find plenty of information for report writing on classroom studies. Each book includes a Want to Know More? section for locating additional information, and an At a Glance section with important dates and related information.Each book explores one of the eight major ecosystems of the world. The books discuss in a lively and interesting fashion what types of plants and animals inhabit the ecosystem, what conditions exist that foster or threaten life, and the important role the system plays in balancing the world's environment. Each system faces threats from modern life, and its current problems and possible solutions are discussed.