Interlocking spurs

• • In the upper course, valleys are steep and V-shaped because most erosion happens vertically downwards.
  • The rivers do not have a lot of energy as there is not a lot of fast-moving water. This lack of energy means that they do not erode sideways (lateral erosion). Instead, they follow the winding path through the valley.
  • These interlocking hillsides are the interlocking spurs.