"In Unit 1, students explore the ways Earth and environmental science describes and explains Earth processes and phenomena that occur in different Earth systems and how they are interrelated. An understanding of Earth processes is essential to appreciate the significance of Earth’s four systems: geosphere, atmosphere, hydrosphere and biosphere. Students investigate phenomena associated with Earth systems and processes. They examine relevant concepts, models, principles and theories to analyse common past and present Earth features, processes and phenomena" (QCAA, 2019).