Planet Earth is about interconnecting systems and processes of the Earth, the solar system, and the universe beyond. Students learn that Earth’s subsystems of geosphere (land), hydrosphere (water), atmosphere (air), and biosphere (life) are interdependent and that all are crucial. The goal is to appreciate that humans can affect this interdependence in both positive and negative ways. Students also will learn that Earth provides all the resources required to sustain life except energy from the Sun, and that, as humans, we act as guardians of these finite resources. This means knowing and understanding the numerous interactions of Earth’s four systems with the solar system. Students can then confront the issues facing our planet and make informed decisions about the protection and wise use of Earth’s resources.