Walker, Sally M

Presents an introduction to the crocodilian dinosaur Sarcosuchus imperator, in simple text with illustrations, describing how it was discovered and what it was like when it lived.

Describes a sea horse living in the coral reefs of the central Philippines, its habitat, life cycle, food, and how it protects itself from predators.

Describes the formation and movement of different types of glaciers, their effects on the land, and how scientists study glaciers.

Describes the discovery of the Civil War submarine, "H. L. Hunley," explaining how scientists found it, raised it, and learned about what was inside.

Presents a children's book for early readers that introduces vocabulary words about sound and sound waves, the speed of sound, and sounds that cannot be heard.

Presents an introduction to light, in simple text with illustrations, describing what it is, how it produces color and heat, and how it bounces and bends.

Presents a children's book for early readers that introduces vocabulary words about what makes heat, how heat moves, and how heat changes matter.

Presents a children's book for early readers that introduces vocabulary words about electricity, what it is, how it is used, the parts of an atom, and more.

Describes the physical characteristics, behavior, life cycle, and endangered status of rays.

Introduces these aquatic mammals by describing their physical characteristics, life cycle, behavior, relations with humans, and threats to their survival.