Description In the Arizona desert stands a stunning rock formation called The Wave. How did the rock?s colorful layers form? How were its wave-like, curves created? This book features a clear, accessible, step-by-step explanation of how sedimentary rock forms. It also explores how erosion by wind and water can shape rocks into amazing structures. Filled with information perfectly suited to the abilities and interests of an early elementary audience, this colorful, fact-filled volume gives readers a chance not only to learn, but also to develop their powers of observation and critical thinking.