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Every second of every day, deep inside the Earth precious metal, beautiful crystals and vast rocks are being formed. This book reveals the hidden secrets of the world beneath your feet and includes 20 information sections which explain how new rocks are created, and how minerals are mined. The book also discusses the strange and beautiful shapes of crystals and which minerals are used to make everyday things. Nine practical easy-to-do and informative projects are included to help readers understand how geologists work by explaining how to grow your own crystals, pan for gold, and make home-made concrete. This text is for eight to 12 year olds, and can be used at home or at school.