nstruction, and history of the Panama Canal. Short paragraphs provide easy-to-read text, while colorful photos make the book engaging and accessible. The book also includes a table of contents, fun facts, sidebars, comprehension questions, a glossary, an index, and a list of resources for further reading. Apex books have low reading levels (grades 2-3) but are designed for older students, with interest levels of grades 3-7.