Imagine having been around for 13.8 billion years, not always in the same form but transformed many times. Rocks change, transform into different types of rock. Any kind of rock can change into any other kind of rock. Through the eyes and memories of Rock Clan, follow the rock cycle as an element of sand takes many different forms but is essentially the same forever. This visual learning book is for ages 9 - 12. For more information visit www.visual-learning-books.com.