Here's a great start to the exploration of matter! Books are written in Spanish and each features a lab activity, vibrant photographs, colorful graphics, charts, tables, and sidebars. Each book has 32 pages. Titles in this 5-book set include: La evaporación (Evaporation)
La condensación (Condensation)
Los gases (Gases)
Los sólidos (Solids)
and Los líquidos (Liquids).