This book introduces readers to the Boiling River found in Yellowstone National Park and why this natural phenomenon exists. Features include a table of contents, fun facts, infographics, Making Connections questions, a glossary, and an index. QR Codes in the book give readers access to book-specific resources to further their learning. Aligned to Common Core Standards and correlated to state standards. DiscoverRoo is an imprint of Pop!, a division of ABDO.