Twelve-year-old Jack, his younger sister, and the family's teenage foster child Troy go to Yellowstone National Park, where Jack's mother, a wildlife veterinarian, is investigating the report that wolves reintroduced to the park have killed a dog there.

History and description of the great national parks in Utah, as well as the Grand Canyon in Arizona which is geologically connected.

Fish, turtles, and many other creatures make their home among a huge coral reef off the coast of Australia. Great Barrier Reef looks at when and how this reef formed and what the future looks like for the massive ecosystem. Easy-to-read text, vivid images, and helpful back matter give readers a clear look at this subject. Features include a table of contents, infographics, a glossary, additional resources, and an index. Aligned to Common Core Standards...