National Geographic Rock Collection Advent Calendar 2025 is the perfect blend of holiday excitement and educational exploration! Each day leading up to Christmas, our children can unwrap a new gemstone, mineral, or fossil, allowing them to build a fascinating rock collection that ignites curiosity and encourages hands-on learning. With this delightful countdown, we’re not only fostering an appreciation for Earth science but also honing their observational skills with a magnifying glass. 6+ years