Sally M. Walker

Fossils give us a window to the past. Water, sediments, and pressure work together over time to preserve the shape of things that lived long ago. Studying these ancient plants and animals tells us more about our own existence. Have you ever searched for fossils? Unearth some in this book. -From the publisher.

Rocks can be made of many different minerals. By looking at rocks closely, we can tell where they were formed and what conditions they were created in. How do we know these things? And how do we tell different types of rocks apart? Learn about ways to research rocks and what they can teach us about our world.

Discusses the processes used by scientists to discern the identity of the Kennewick Man and what this nine thousand-year-old skeleton revealed about the arrival of humans in North America.

Color photographs and simple text introduce children to the life cycles of opossums, with information on their distribution, physical characteristics, hunting style, and the dangers they face.

Explores what volcanoes are and how they can be both harmful and helpful to human beings.

Why do some things heat up quickly while others don't? How can heat cause matter to change form-from solid to liquid to gas and back again? Heat cannot be seen, but it can easily be felt. Looking at different objects' molecular makeup, this book describes the fundamentals of heat and furthers understanding through a series of easy experiments.

"Rocks, ice and snow. That is all Dr. William Hammer and his crew can see when they look at the land around them on Earth's coldest continent. But on top of a mountain, the scientists discover a 190-million-year-old fossil. It is the remains of the first dinosaur found on mainland Antarctica. Learn more about the hunt for fossils in Antarctica and what life might have been like there millions of years ago."--from p. [4] of cover

Discusses the mysterious disappearance of the Confederate submarine, the H.L. Hunley, and its recent recovery from deep in the waters off the coast of South Carolina.

Describes the life and accomplishments of Bessie Coleman, who overcame racism and poverty to become the first African American woman pilot.