Meet workers who chase tornadoes, climb erupting volcanoes and cell-phone towers, and even dive into raw sewage! This high-interest nonfiction series includes reading experiences in five content areas: Life Science, Earth and Space Science, History/Social Studies, Technology, and Careers. It introduces grades 4-8 content-area vocabulary in a medium that struggling readers can master. Read-UP! with 3 levels of readability. Each level (set of 5 books) contains a book from the five content areas, so a student can keep reading in one content area if he or she prefers.