How is a valley formed?
A valley is a low-lying vicinity of land that is generally determined at the foot of mountains or hills. The most common way valleys are formed is with the aid of the erosion of land from running water. River valleys are formed through the action of the river. As a river flows downhill, it cuts via the land like a knife. Over hundreds of years the river erodes the land to structure a valley, typically in the shape of a V. In contrast, valleys formed by glaciers are regularly U-shaped, because they are formed with the aid of rocks carried in the glacier that erode the soil.
