How was the Earth formed? When did living things first appear? Why is the climate getting warmer? This book investigates the fundamental mysteries of how our planet was formed and how it was developed. Not so long ago, the world was as unknown and mysterious as the outer limits of space still are to us today. But in recent years scientists have learned a great deal about our planet and have begun to understand how it works. Pictures taken from space proved that the Earth is just a tiny blue globe spinning around in the vast emptiness of space, while probes into the ocean depths have revealed a remarkable undersea landscape as varied as those on dry land. There are information sections explaining the marvels of the Earth and practical projects to reinforce learning and help young readers to make their own discoveries.