Gr 1–3—Vibrant, full-page photos combine with accessible, comprehensible text in this fresh exploration of all things rock. While the subject matter could have been dry and uninteresting, it is instead engaging, thanks in part to quick facts, stunning images, and an appealing design. Interactive elements, such as sidebars with open-ended questions and the experiments found in "Science Lab," allow young readers to gain a better understanding of the topic through hands-on and critical thinking activities. The books contain a pronunciation guide in the glossary but not within the text, which may present challenges to readers. While some repetition is to be expected, especially between the individual volumes dedicated to the three rock types and What is the Rock Cycle?, several points are noticeably repeated throughout the series. Disappointingly, "Websites" directs readers to the publisher's webpage for links to online resources rather than provide the actual web addresses. In spite of some flaws, these are inspired, attention-grabbing titles.