The mountains are known to possess the highest relief of all the landforms found on Earth. And of all the mountains, Mount Everest at 8,850  metres has the highest relief. Landforms are formed as a result of the movement of the tectonic plates under the Earth crust and are the cause of the creation of continental mass, the mountains, hills, valleys, canyons, etc. Some landforms such as the third-order landforms are formed due to the erosion and deposition activities by environmental agents.