Become an eyewitness to the rocks and minerals beneath your feet, covering everything from volcanic rocks and shiny gemstones to ancient marble and fallen meteorites. Did you know that every rock is a combination of one or more minerals? Or that marble was first used in ancient Greece but still forms deep underground as you read this? Unearth the hidden treasures of the earth's surface, and find out how they all came to be here. Almost 20,000 meteorites land on our planet every year, but what does a space rock actually look like? Find out how to spot and identify minerals and fossils, discover how crystals grow, and what you need to start your own collection. Loved and trusted for over 30 years, Eyewitness has a new look and even more content: - A bite-sized formula of text with images that kids love - Fully revised and fact-checked by subject specialists - Packed with facts, infographics, statistics, and timelines - Updated with brand new eyewitness accounts from experts in the field