Rocks are found on Earth's surface and in its crust. The crust is the outermost layer of the planet. Find out more in Hocks and Gems, part of the Awesome Infographics series. Each title in the Awesome Infographics series features engaging facts and colorful illustrations to provide young readers with a fascinating look at the world we live in. Awesome Infographics is a series of AV2 media enhanced books. A unique book code printed on page 2 unlocks your interactive eBook. These books come alive with video, audio, weblinks, slideshows, activities, and much more. Book jacket.