8Gather your gear and descend into Earth's underground openings! In this title, young readers are introduced to caves, including the different types of caves, how they form, what lives inside them, and how humans impact them. Readers will build reading skills through leveled text and interesting, labeled photos. Special features profile a famous example of the landform, show the parts of caves, highlight cave animals, and more. Discover the wonder of the dark world of caves!