Readers follow two enthusiastic rock hounds around the globe as they add to their collection. Along the way they will learn how sedimentary, metamorphic, and igneous rocks are formed. From the Egyptian pyramids to Roman roads, from the diamond ring on a finger to the pebbles under your feet, rocks are everywhere! This is a Level 2 Let's-Read-and-Find-Out, which means the book explores more challenging concepts for children in the primary grades. The 100+ titles in this leading nonfiction series are: Books in this series support the Common Core Learning Standards, Next Generation Science Standards, and the Science, Technology, Engineering, and Math (STEM) standards. Let's-Read-and-Find-Out is the winner of the American Association for the Advancement of Science/Subaru Science Books & Films Prize for Outstanding Science Series.