Grade 2 - 8. Focus on grade-appropriate subjects with convenient, themed chart packs. Popular topics such as the solar system, weather factors, layers of the earth, geography terms, and the water cycle are grouped for developing teaching units with ease. Introduce one chart at a time, or display the entire combo pack for year-round reference. Sturdy and durable charts have reproducibles, tips, and teaching information on the back. Each chart measures 17"W x 22"H.