Third order landforms are formed on mountains, plateaus, and plains mainly by erosional and depositional activities of rivers, glaciers, winds, and waves. Examples of third order landforms include valleys, beaches, sand dunes, individual peaks, cliffs, hills, spurs, gorges, caves, moraines, cirques, ripples, and more. Therefore, third order landforms are a type of landform that is formed by the action of natural forces on the earths surface.