External geological processes
The energy that comes from the sun causes external geological agents to transform the relief. The action of the water of the rivers and streams, the wind, the ice, the atmosphere, contribute in the destruction of the relief . The living beings are also involved so naturally, or artificial, in the case of humans, in the transformation of the relief.
The external geological processes (weathering, erosion, transport and sedimentation) model relief, gravity transporting materials from higher areas to lower.
The geological processes produced by external geological agents and that modify the relief are: