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 waterfalls, rapids, meanders, and the life story of rivers from birth to old age. In 101 Facts About Rivers, you'll also find fascinating facts about the plants and animals that make rivers their home.