Answer:
If trees were added to a mountain formation, they were likely added as a measure to prevent erosion rather than being an agent of erosion themselves. Trees have roots that can help stabilize soil and prevent erosion from occurring.
When rain falls on a bare mountain slope, it can cause the soil to erode and wash away, leading to landslides and soil instability. However, when trees are present, their roots hold the soil in place, making it less likely to wash away. The trees also help to absorb some of the water, reducing the amount of runoff that can contribute to erosion.
In addition to preventing soil erosion, trees can also help to prevent other forms of erosion, such as wind erosion. The leaves and branches of the trees can act as a barrier, slowing down the wind and reducing its ability to erode the soil.
In summary, trees are typically used as an agent to prevent erosion rather than as an agent of erosion. Their roots stabilize the soil, and their presence reduces the amount of water and wind erosion that can occur.