* Canyons: Canyons are deep, narrow valleys with steep sides. They are formed by the erosion of rock by water, ice, or wind.
* Mountains: Mountains are formed by the uplifting of the Earth's crust. They can also be formed by the erosion of valleys.
* Hills: Hills are small, rounded elevations of the Earth's surface. They are formed by the erosion of valleys.
* Plateaus: Plateaus are large, flat areas of land that are higher than the surrounding terrain. They are formed by the erosion of valleys.
* Deserts: Deserts are dry, barren areas of land that receive very little rainfall. They are formed by the erosion of soil and rock by wind.