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What are igneous rocks? What are metamorphic rocks? What are ores and minerals? This encyclopedia will answer these and more hows and whats about formation and types of rocks, and minerals found in the earth's crust. Learning is made simpler with accurate information, mesmerizing images and an extensive glossary of difficult words. Bonus: the book comes loaded with Isn't It Amazing-a section of fun facts to keep you glued for more.