This grade 3 textbook, the third in a series of elementary science textbooks written in Portuguese, consists of readings, activities, and review exercises on biological, physical, geological, and nutrition/health concepts. The book is organized into nine sections. Among the topic areas included in these sections are: (1) solar energy, electricity, and light; (2) solar system, planets, earth motions, and phases of the moon; (3) gravity, rocks, and erosion; (4) atmospheric phenomena; (5) water and water resources; (6) plants found in deserts, forests, and savannahs, and plant products which are used as food; (7) animals found in deserts, forests, and savannahs; (8) the bodily senses and health concepts; and (9) changes in states of matter. (JN)