For nearly five billion years, the Earth’s surface has been constantly built up and broken down by processes taking place beneath and above the Earth’s surface, resulting in the wide range of beautiful and complex landscapes we see today. In this unit, students will continue to make connections between the Earth’s systems when they study interactions between the lithosphere, atmosphere, hydrosphere, and biosphere by investigating the rock cycle, water cycle, and processes of erosion such as wind, wave action, and mass movement.