Final answer:
Large landforms that are steep and rise above their surroundings are called mountains, which are formed through tectonic processes and differ from other landforms such as riverbeds, plains, and valleys.
Step-by-step explanation:
Large landforms that are steep and rise above their surroundings are called mountains. A mountain distinguishes itself from other landforms such as riverbeds, plains, and valleys due to its significant height and steep slopes. Unlike a plateau, which is an elevated flat area larger than a mesa, a mountain is characterized by its pronounced peak and high elevation.
Mountains are created through various physical processes, including tectonic movements where Earth's crustal plates converge and push upwards, forming mountain ranges.
These processes are part of the study of different landforms under WG.4B, which describes the development of plains, mountains, islands, and other features. Understanding these natural occurrences provides insight into the geophysical behaviors of the Earth.
In contrast to mountains, other options like riverbeds describe the bottom of a river channel; plains are large, flat expanses of land; and valleys are low-lying land areas between mountains or hills. All are different types of landforms, contributing to the diverse geology of our planet.