Rocks are everywhere, but where do they come from, and how are they formed?This is another book that answers questions for young readers about the world around them.Here you learn about igneous, sedimentary, and metamorphic rocks.How are they made and what are some examples of them?What is Moh’s Hardness Scale?All the information is presented simply, and the pictures give the book a gentle, picture book quality.What is marble anyway?