Christine Petersen

Discusses how human use of land and increasing population have threatened natural landscapes and describes the establishment of national parks as a means of preserving these resources.

"Study Soils introduces readers to what makes up soil, from humus and plants and animals to water and air. Learn how weathering, erosion, parent material, decay, bacteria, organic matter, climate, and time contribute to soil formation. A geology-themed project provides the opportunity for hands-on experience." --

Looks at how water has shaped nature, describes how the power of water can be harnessed for electricity, and discusses some of the benefits and drawbacks of using water-generated energy.

"Explore the life of a colonial glassblower and his importance to the community, as well as everyday life, responsibilities, and social practices during that time"--

A close look at past and present vertebrates, including fish, birds, amphibians, reptiles, and mammals.

Describes where pearls come from, how they are formed and how they are used.