epigean

Epigean refers to a geological term that describes the uppermost layer of the Earth's crust, which is the part of the crust that is exposed above sea level. This term is often used in the context of geology and geomorphology to discuss the processes and features that occur in this upper layer of the Earth's crust. Epigean processes include weathering, erosion, and the formation of landforms such as mountains, valleys, and plains. These processes are driven by various factors, including tectonic activity, climate, and biological activity. The epigean environment is distinct from the hypogean environment, which refers to the underground or subterranean parts of the Earth's crust. The study of epigean processes is crucial for understanding the Earth's surface dynamics and the evolution of landscapes over time.