Traditionally, geography is studied as two interconnected parts: physical geography and human geography. For the first half of this series, we will be focusing on physical geography, which is all about recognizing the characteristics of the environment and the processes that create, modify, and destroy those environments. But remember, human-environment interactions are fundamental to studying geography so we won't be ignoring human impact, it just won't be the primary lens we're using to view the world. Today, we'll explore erosional gullies in Madagascar as we discuss the world's dynamic landscape, the Great Barrier Reef as we introduce the four major earth system (the atmosphere, hydrosphere, lithosphere, and biosphere), and we'll finish with a deep dive into Iceland as we introduce the major realms of physical geography.