Read and Understand, Science, Grades 3-4 presents stories that range from low-third grade to high-fourth grade in readability. Topics presented in Read and Understand, Science, Grades 3-4 include: Life Science - role of sleep, the five senses, role of play in animals, bird habitats, importance of fire in an ecosystem, animal classification, wild animal adaptation to living near humans. Physical Science - how sound is produced, physical and chemical properties, states of matter, magnetism and compasses, heat and insulation, natural and artificial light. Earth and Space Science - soil, kinds of rocks, fossil fuels, the solar system, solar eclipse, hail, types of mountains, fossils and petrification. Science and Technology - biography of an engineer, sustainable agriculture, research into animal brain function, recycling, CT scans, use of Earth's material resources.