Grade 4

In this book, early fluent readers will learn about the unique maneuverability of hummingbirds. Vibrant, full-color photos and carefully leveled text will engage young readers as they learn… More →

In this book, early fluent readers will learn about the powerful strength of rat teeth. Vibrant, full-color photos and carefully leveled text will engage young readers as they learn more… More →

Did you know mound ants can lift 5,000 times their own weight? Or that chameleons can quickly change color? Each book in Nature’s Superheroes highlights a specific animal, discussing the… More →

From crossing vast oceans to exploring outer space, we continue to push the limits of our scientific and engineering capabilities. But what happens when our pursuits don't go as planned? What More →

In Mountains, early fluent readers learn about the geologic processes that create mountains around the world. Vibrant, full-color photos and carefully leveled text will engage young readers… More →

In Rivers, early fluent readers learn about the geologic processes that create rivers around the world. Vibrant, full-color photos and carefully leveled text will engage young readers as they More →

In Volcanoes, early fluent readers learn about the geologic processes that create volcanoes around the world. Vibrant, full-color photos and carefully leveled text will engage young readers… More →

In Waterfalls, early fluent readers learn about the geologic processes that transform the earth into waterfalls. Vibrant, full-color photos and carefully leveled text will engage young… More →

In Canyons, early fluent readers learn about the geologic process that creates a canyon out of solid rock. Vibrant, full-color photos and carefully leveled text will engage young readers as… More →

In Caves, early fluent readers learn about the geologic processes that create caves, as well as the unique animals and formations inside. Vibrant, full-color photos and carefully leveled text More →

Our world is full of majestic landforms, from echoing caverns to lava-spewing volcanoes. This dynamic series teaches young readers about the processes that transform the earth and introduces… More →

In this book, early fluent readers will explore the role of the circulatory system in a healthy, functioning body. Vibrant, full-color photos and carefully leveled text will engage young… More →