The term CLIMB THE ___ can be filled in with the solutions WALLS (5 letters), SCALE (5 letters), IVY (3 letters), and ASCEND (6 letters). Climbing walls, scaling, and ascending are all activities that involve using one's body to ASCEND a vertical surface. Climbing walls are typically man-made structures with handholds and footholds that allow a person to climb up the wall. Scaling is similar to climbing walls, but it involves using natural features such as rocks or trees to ASCEND a vertical surface. IVY is a type of plant that can be used to climb up a wall or other vertical surface. Ascending is the act of moving upwards, which can be done on any type of vertical surface.