Mountain
a large or very high hill; a large mass of earth rising to a great height above the level of the adjacent land; a high elevation or prominence ⚫upon the earth's surface; a high mount.
In geography, mountains usually exist in chains, the highest being the Himalayas. Parallel to a leading mountain chain there are in some cases two others of inferior elevation, one on each side.
Sir Charles Lyell proved that every great mountain is the result, not of one upheaval, but of many. The composition of the different parts of a mountain regulates its form; trappean rocks, for instance, tending to make one or more table lands with precipitous sides, and granite a rounded top.