About the Author

Kathleen Weidner Zoehfeld is the award-winning author of more than sixty books, including How Mountains Are Made, What Is the World Made Of?, What's Alive?, and What Lives in a Shell? When she's not reading, researching, writing, or editing, Kathleen loves to spend her free time exploring, doing fieldwork, and preparing fossils in the laboratory for her local natural history museums. She lives in Berkeley, CA.