Simple text and photographs present information about the planet Mercury.

Simple text and photographs present information about the planet Jupiter.

Simple text and photographs present information about the planet Pluto.

Simple text and photographs present information about the planet Earth.

Unlike most other planets, Venus can be seen from Earth's surface with the naked eye. Only the moon burns brighter in the night sky. Readers will learn why Venus's thick clouds help make the planet so hot and why its days last so long. They will also get an up-close look at Venus's remarkable land features and find out how scientists have studied the harsh surface of the planet.

Discusses some of the things explorers of North America were looking for, including a trade route to Asia, a city of gold, and the Northwest Passage, and describes the Lewis and Clark expedition.

Simple text and photographs introduce the respiratory system and its purpose, parts, and functions.

Explains what a constitution is, discusses why the thirteen American colonies felt the need for a central government, introduces five framers of the U.S. Constitution, describes the convention at which the document was created, and considers the relevance of the Constitution in the modern world.

A young child describes some of the many ways water is used.