Come closer and look at these rocks: they're not normal stones at all! They're thousands and thousands of mollusks, fossilized together in the sediment. But how did a million oysters ever land on top of a mountain?  Written by a geologist, this inquisitive journey guides readers through the movements of seas, strata, and tectonic plates. The landscapes of the present can be clues to events in the past. Lush, atmospheric illustrations offer fascinating details to discover, and sidebars and an extensive glossary provide intriguing connections to marine biology and scientific history.  A compelling introduction to earth science, this book will encourage readers to ask questions, think critically, and embrace their curiosity about the natural world.