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Gr 5–8—This beautiful book begins with a large fold-out page where living things, or organisms, are described down to cellular detail, along with an explanation of how life is classified by scientists, a review of rocks and fossils, and a brief time line of the first two billion years of life on Earth. After that, the book is divided into chapters corresponding to each geologic era from Proterozoic (2.5 billion to 542 million years ago) to the more "modern" Neogene Era (2.3 to 2.6 million years ago)...Log In or Sign Up to Read More