Walker, Sally M

Describes the types of sedimentary rocks, and the processes that lead to their formation.

Describes minerals, what they are made of, identification of minerals, and uses for minerals including salt for flavor, diamonds for beauty, and more.

Describes the Earth's different kinds of rocks and how they were formed.

Describes the life and accomplishments of baseball star Jackie Robinson, who became the first African American in twentieth-century major-league baseball.

Eight-year-old Letty attempts to save her pet goose from marauding British soldiers in New Jersey during the Revolutionary War.

Describes volcanoes, where they form, the kinds of lava and landforms they create, and how volcanologists are learning to predict eruptions.

An introduction to sound that explains what sound is, how it travels in waves, how scientists measure the speed of sound, and how music is made and heard.

Full-color photographs and text describe the physical characteristics, behaviors, and habitat of Jaguars.

Describes the physical characteristics, life cycle, and behavior of crocodiles, as well as efforts to protect them.

Explains the concept of work, describes machines and the parts of a lever, and includes simple experiments.