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Where do diamonds come from? What makes gems sparkle? How did Mount Everest and the Grand Canyon form? Find answers to these questions and many more in this rockin' reference book. Welcome to the amazing world of rocks and minerals! Let's start at the very beginning, with an introduction to the origin of our rocky planet, then move on to explore the world of igneous, sedimentary, and metamorphic rocks. You'll discover how they form, what makes them unique, and most importantly, how to identify them in your own garden. Complete with the origin and description of some of the most important rock-forming minerals, readers will discover how some of the most beautiful and precious stones on the planet are created by the Earth itself. Each chapter includes dozens of profiles of amazing rocks and minerals, fun facts, sidebars, photo galleries, and more. At the end of the book readers will get to meet a real geologist and learn just what it's like to dig in the dirt for a living. Thematic spreads cover topics such as birthstones, cool crystals, digging for diamonds, and more. And, of course, amazing photography and colourful graphics add visual awe to the lively text. Fans of other National Geographic Kids Ultimate "pedias" in the same series-Dinopedia, Bugopedia, Reptileopedia, Oceanpedia, Predatorpedia, and Weatherpedia-will want to add Ultimate Rockopedia to their must-have list.