Even though Mount Everest measures 29,028 feet high, it may be growing about two inches a year. A mountain might be thousands of feet high, but it can still grow taller or shorter each year. Mountains are created when the huge plates that make up the earth's outer shell very slowly pull and push against one another. Read and find out about all the different kinds of mountains. The earth's continents rest on plates that move slowly across our planet's...

Offers a colorful introduction to the world of a young penguin and his family.

Simple language and humorous illustrations show how forces make things move, prevent them from starting to move, and stop them from moving.

Describes the sun and how it provides the light and energy which allow plant and animal life to exist on the earth.

Introduces the characteristics and habitat of polar bears and explains how climate change is threatening their survival.

Describes the formation and characteristics of igneous, metamorphic, and sedimentary rocks and how to recognize and collect them.

Examines life aboard a space shuttle, describing how astronauts deal with weightlessness, how they eat and exercise, some of the work they do, and more.

Explains how bacteria and viruses affect the human body and how the body fights them.