Video module/lectures: paleogeography; ice ages; physiographic regions. Human geography incorporates a variety of philosophical perspectives in its approaches and analysis such as: Within human geography, there are several central concepts that serve two primary endeavours: the need to establish facts (geographic literacy) and the need to understand and explain the facts (geographic knowledge). Human geographers also employ qualitative and quantitative approaches to assess human relationships to their environment. Human geographers employ a variety of techniques of analysis based on the use of maps. Contemporary human geography has benefited from the information age. By the mid 19th century geologists could understand how the rocks on earth had been laid down. Through the process of sedimentation, the shales, sandstones and limestones are deposited on earth. Uplift and erosion are the principles by which mountains are formed and new sediment is laid down. Volcanism, faulting and folding alter the beds and create new landforms.