The outside layer of our planet is an active place. Earth's crust is always growing and changing. But do you know how Earth's crust forms? And what happens when its plates shift suddenly? Find out more about the moves that make mountains and ocean ridges in this interesting book!

In this Early Bird title, readers learn about the physical characteristics, habitat, and behavior of Galápagos Tortoises.

In this Early Bird title, readers learn about the physical characteristics, habitat, and behavior of the piranha.

Audisee® eBooks with Audio combine professional narration and text highlighting for an engaging read aloud experience! The circulatory system is made up of the heart, the blood, and strong tubes called blood vessels. But what does the circulatory system do? And how do its parts work together to keep your body healthy? Explore the circulatory system in this engaging and informative book.

In this Early Bird title, readers learn about the physical characteristics, habitat, and behavior of the javelina.

Updated for 2020, Early readers examine how volcanoes, earthquakes, and erosion change the surface of the Earth.

In this Early Bird title, readers learn about the physical characteristics, habitat, and behavior of the gila monster.

Conrad J. Storad explains what fossil fuels are and how we use them. He discusses coal, oil and natural gas, and also includes a chapter on alternate energy sources.

Updated for 2020, Intermediate readers explore the difference between climate and weather.

Early Readers Explore Different Weather Conditions And What Causes Them.