The moon does so much more than shine at night. Have you ever wondered how the moon was formed or why it changes shape in the sky? The moon's story began 4.5 billion years ago, but it continues to affect everything we do today, from weather to timekeeping. Award-winning science author Robert E. Wells explains how and why the moon matters in our lives--and for the future of space exploration.

Dive into our oceans to learn why we need them--and why they need us. Our five oceans cover about 71 percent of the earth's surface and hold about 97 percent of our water. A central part of the planet's water cycle, oceans are essential to all living things. They are home to thousands of species, and they provide humans with food and medicine. Oceans are one of the world's most valuable natural resources, and we must take care of them.

Take a journey through the heart of the Amazon rain forest to discover why it's so important for life on Earth. Even though rain forests take up less than 10 percent of Earth's land, they are home to more than half the world's plants and animals. In this adventure, readers climb aboard a river boat and tour the Amazon with a local guide. Observe howler monkeys, harpy eagles, and other wildlife as you discover how the planet's largest tropical rain forest became endangered, and why it's up to us to protect it.