Impact Valleys
Orkney Riddle Impact Valleys Departing from archaeology to examine the geology of Britain as it has affected the topography of both Britain and the North Sea, the impact valley is a necessary component for an understanding of our prehistoric landscape. Olchon valley and Black Mountain from Longtown Castle Definition of a valley "A valley is a long depression on the Earth's surface that commonly hosts a river and lies in a relatively flat plain or between hills or mountains. Valleys can be formed through various processes, including river erosion, glacial activity, or tectonic action. Tectonic valleys, also known as rift valleys, are formed by the subsidence of the Earth’s crust between faults. River valleys are created by the incising action of rivers. Glacial valleys, often U-shaped, are created as glaciers erode the landscape. Valleys come in different forms, such as canyons, gorges, and rift valleys. Canyons are deep, steep-walled ...