Our World in Pictures Rocks & Minerals Flash CardsA fun way to learn about rocks and minerals from all over the world Discover the wonders of our rocky planet This amazing deck of cards welcomes you to Earth's extraordinary minerals and gems, from sparkling emeralds to igneous rocks formed deep inside the Earth's molten core. Stunning pictures and fast facts will allow you to grasp a wealth of knowledge in a fun way. Each card contains snappy and accessible information, displaying each rock or