One is high and one is low—but mountains and valleys have a lot in common as one forms when the other does! Covering parts of mountains and valleys, how they form, common wildlife, and even famous examples of them on Earth, this book offers a comprehensive introduction to these landforms in an age-appropriate, accessible way. A colorful design, complete with diagrams and labeled images, engages readers with the subject matter as activities and a final quiz encourage applying what they've read.