What are rocks? How do fossils form? Are rocks different across the world? The Rocks Book has all the answers for curious readers, budding geologists - and petrologists! This comprehensive guide leaves no stone unturned and covers every topic imaginable, from investigating the many different varieties of rock, to learning about rocks from space, and even sharing tips on how to collect rocks sustainably. Our world is a rocky planet - to know its rocks is to know the Earth. There's no better introduction for kids than this.