This continuation of Seventh-Grade Science, Part 1 looks at introductory science principles on a larger scale—it includes a discussion of human body systems, properties and states of matter, Earth’s spheres and natural resources, Earth-related astronomy, and principles of ecology. This is the second course in a two-part seventh-grade science series (GSCI 031 and GSCI 033); however, either course may be taken independently of the other.