Hirsch, Rebecca E

Provides information about polar bears and discusses fifty reasons to care about them including their biology, behaviors, and their place in ancient and present cultures. Discusses the threats that are posed to polar bears by nature and man, the threat of global warming, depicts the conservation efforts by scientists to save the bears, and proposes ideas for individuals to help in the conservation of polar bears. Includes photos, a glossary, and an index.

Provides an overview of the properties of matter and helps students develop their research and critical thinking skills through interactive lessons and easy-to-follow text.

Introduces students to the scientific concepts of motion and force, describing how they work and what role they play in the world around them.

Interactive scenarios and photographs describe the life cycle of plants. Includes hands-on activities.