You'll discover fun facts like how the Earth was formed, why we can't live on Mars if the Earth is getting warmer, and much more. This book is perfect for all curious young minds ages 6-8 who want to discover the wonders of the world. Children have some of the most inquisitive minds on the planet, making them the perfect set for DK's exciting Earth encyclopedia, Why Does the Earth Need a Moon?, which covers all the great topics - from geography, geology, and science, to questions about living things, humans, and history