You have probably seen movies or television shows about space travel. When space travelers go outside their ships, they use jet packs to tie themselves to their ships. They do this because outside their spaceships there is no force that keeps them attached to the craft. Without something to keep them attached, they would just drift off into space because there is no gravity. Gravity is also the reason why our bodies don't just fly upward into...

Explores oceans, discusses how they affect the climate, and describes the variety of life forms found there.

"This book details the science of electricity and magnetism. It explains how these forces work, how they are related, what uses people have found for them, and more."--

"This book details the history, current uses, and potential future applications of geothermal energy."--

Discover the brief, brutal period of U.S. history known as the gold rush. Characterized by hope, greed, enterprise and thug rule, the gold rush transformed life in America--and began in January, 1848, with James Marshall's accidental discovery of gold in California.

"Learn all about Grand Canyon National Park, including how it was formed, which wildlife can be found there today, and how it is affected by environmental issues."--Provided by publisher.

From the tall peaks of the Rocky Mountains to the rolling hills of the Intermontane Basin to the rushing waters of the Colorado River, Colorado is full of natural beauty. Readers will take a tour of this incredible state. They will get a chance to see the natural landscape, find out how people live in Colorados towns and cities, learn about the states history, and much more.