Susan Heinrichs Gray

"When you think of dinosaurs, do you think of ferocious meat-eaters terrorizing everything around them? If so, you were probably imagining the Tyrannosaurus rex, the 'tyrant lizard' of its time. But if you think you know everything there is to know about T. Rex, think again! Learn about the many sides of this mighty dinosaur. Additional features to enhance comprehension include informative sidebars, a glossary of key words and phrases, sources for...

Describes what is known about the physical characteristics, behavior, habitat, and life cycle of this plant-eating, duck-billed dinosaur.

Describes what is known about the physical characteristics, behavior, habitat, and life cycle of this slow-moving vegetarian dinosaur.

"Life was often difficult for the Iguanodon. It couldn't fight larger dinosaurs with sharp teeth or pointy spikes. Even thunderstorms could pose a danger. Learn how Iguanodon survived on Earth for nearly twenty million years and why its fossils have been discovered all over the planet. Additional features to enhance comprehension include informative sidebars, a glossary of key words and phrases, sources for further research, a Did-You-Know section,...

Explains what geology is, shows how the Earth itself and rocks change, and looks at how geologists study the polar regions and outer space.