Which of the following is not an importance of Geographic Information System(G.I.S)

________ are projection of highlands into low grounds i.e the v-shape points to the low land?

_______ is a large mass of igneous mound with a dome-shaped upper surface and a level base?

The instrument used in measuring the intensity of an earthquake is known as?

_________ is formed when two corries cut back opposite sides of the same mountain, resulting in a knife-edged ridge