* Erosion is the process of wearing away and transporting material. In the case of mountain tops, erosion removes rock and soil, changing the shape and height of the mountain.

* Constructive forces build up landforms. This includes processes like deposition, where sediment is added to a location.

* Destructive forces break down landforms. Erosion is a primary example of a destructive force.

While erosion might eventually lead to the formation of new landforms, the process itself is destructive. It breaks down existing landforms like mountain peaks.