GEOLOGY

Detailed explanation-1: -They are formed by strong streams, which over time have cut down into the rock through a process called downcutting. These valleys form in mountainous and/or highland areas with streams in their “youthful” stage.

Detailed explanation-2: -A V-valley is formed by erosion from a river or stream over time. It is called a V-valley as the shape of the valley is the same as the letter “V”.

Detailed explanation-3: -They all take the form of a “U” or “V.” Rivers and streams make most primary valley cuts, carving steep-walled sides and a narrow floor that from afar looks like the letter “V.” The gradient of the river-how quickly it drops-helps define the steepness of the sides and the width of the floor.

Detailed explanation-4: -Rivers begin high up in the mountains so they flow quickly downhill eroding the landscape vertically. The river cuts a deep notch down into the landscape using hydraulic action, when the sheer force of the water gets into small cracks and breaks down the sides of the river valley.