Susan Heinrichs Gray

Presents general information about paleontologists, what they learn about prehistoric animals and vegetation by studying them.

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

Understanding motion is a key concept in the field of physics. Readers will learn about forces such as inertia and friction as they complete the exciting experiments in this book. The discoveries of scientists such as Isaac Newton and Leonardo da Vinci are highlighted to illustrate how our understanding of motion has changed over time.

Describes dinosaur footprints and what people can learn from them.

"Have you ever tried putting together a puzzle without knowing what it would look like when you had finished? If you have, you know what Othniel Charles Marsh felt like as he put together the bones and plates of a Stegosaurus he had discovered. Follow Stegosaurus from its life on Earth millions of years ago to its reconstruction in a museum--bones, plates, and all! Additional features to enhance comprehension include informative sidebars, a glossary...

"Imagine walking down the street and running into an Ankylosaurus. Its heavy, plated body and thick spines would surprise anybody! But despite its size and armor, this 'stiff lizard' could move pretty quickly when it needed to. Discover how Ankylosaurus continues to surprise scientists--and unsuspecting readers--to this day. Additional features to enhance comprehension include informative sidebars, a glossary of key words and phrases, sources for...