At the root of the tree-based surface cause the strength of the surface area and which can prevent erosion from landslide because the root is based on surface.
The roots of the trees hold the soil surface, causing the strength of the soil surface, which can prevent erosion from landslides because the roots hold the soil surface.
The roots of the tree based on the surface causes the strength of the soil surface, which can prevent the collapse of the landslide because the roots based on the soil surface.