Why do mountains get bigger? Where is the hottest place on Earth? Why are oceans and lakes changing size? How does a river carve out a valley? Why are tropical rain forests vital for the future of the planet? 101 Facts About Our World answers all these questions and more about our amazing world. Best of all, these books are packed with spectacular photos that show the stunning beauty of Earth's natural features. Learn about tropical rain forests and why these areas are vital to our survival. In 101 Facts About Tropical Rain Forests, you'll also find fascinating facts about the animals that live in the treetops.