There are many fascinating archaeological periods in human history. During these periods, ancient peoples adapted to their changing environments, developing new tools, homes, and ways of life. Historical Ages explores a variety of archaeological periods, taking a closer look at how people lived during those periods and how experts continue to make important discoveries about them. Core Library is the must-have line of nonfiction books for supporting the Common Core State Standards for grades 4-8. Core Library Features: A wide variety of high-interest topics, Well-researched, clearly written informational text, Primary sources with accompanying questions, Multiple prompts and activities for writing, reading, and critical think, Charts, graphs, diagrams, timelines, and maps.