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These are great for kids - or adults. They are beautifully laid out with pictures showing examples of all the rocks. For a visual learner this is fantastic. I bought this for my 5 year old nephew, and along with a bag of rocks for him to identify it made a great gift. I wouldn't hesitate to buy or recommend any DK book.
My son is really into rocks and minerals atm so this book is perfect for him. He has a big imagination and will claim that a rock has diamonds in it etc so this book will help to hopefully identify what it is he is actually discovering. I'm sure this will fuel his curiosity more.