The massive, majestic Grand Canyon stretches hundreds of miles through northern Arizona. Its layered rock walls are a time capsule of Earth's geologic history, while its depths are home to unique ecosystems. Today, this natural wonder is part of a popular national park. Grand Canyon National Park provides historical information about the canyon and an overview of what visitors can see and experience at the park today. Features include a glossary, a map, references, websites, source notes, and an index. Aligned to Common Core Standards and correlated to state standards. Essential Library is an imprint of Abdo Publishing, a division of ABDO.