Christine Petersen

"Explores the development of genetics and the many uses it provides us with, such as how they are inherited from parent to child, help solve crimes, and identify disease-causing genes."-- Publisher's website.

Introduces readers to what gems are and how they form, including mineral gems and organic gems.

Introduces diamonds, discussing what they are, what they look like, and where they are found.

Describes what gold is; and discusses the different uses for gold, gold mining, gold rushes, and the role of gold in history; and highlights the top gold-producing countries.

Explores the countries and cities, landforms and climate, natural resources, people and cultures, and economics of North America. Features color photographs and maps, a glossary, and further resources.

Introduces readers to what makes up soil, from humus and plants and animals to water and air.

A close look at past and present invertebrates, including sponges, jellies, worms, mollusks, and arthropods.

Describes some of the earth's natural resources, their importance, and how they can be safeguarded.

Investigate Gemsintroduces readers to what gems are and how they form, including mineral gems and organic gems. Learn about crystal systems, imitation and synthetic gems, cultured pearls, how gems are used, and their historic importance. A geology-themed project provides the opportunity for hands-on experience.

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