A person who studies mountains is called a geomorphologist. Geomorphologists are scientists who study the physical features of the Earth's surface, including mountains, hills, valleys, and other landforms. They study the processes that create these features, such as erosion, deposition, and faulting. Geomorphologists also study the history of the Earth's surface, including how it has changed over time. They use a variety of tools and techniques in their research, including maps, aerial photographs, satellite images, and field observations. Geomorphologists work in a variety of settings, including universities, government agencies, and private companies.