A mountain is considered to be a large land form that extends above the surrounding land in a limited area, usually ending in the form of a peak. Mountains are generally steeper than hills. Mountains are formed through tectonic forces or volcanism. These forces can raise the surface of the earth locally. Mountains erode slowly through the action of rivers, weather conditions & glaciers. A few mountains are isolated summits, but most occur in huge mountain ranges.
High elevations on mountains produce colder climates than at sea level. These colder climates strongly affect the ecosystems of mountains: different elevations have different plants & animals. Because of the less hospitable terrain & climate, mountains tend to be used less for agriculture & more for resource extraction & recreation, such as mountain climbing & skiing.