11.Which one of the followig terms refers to the process of scooping the soil and blowing it away in arid areas ?

12.Plutonic earthquakes have their focus at a depth of

13.The intrusion of lava into vertical structures forms Dykes while the intrusion of lave into horizontal layers will form

14.The movement inside the Earths crust is studies by

15.The phenomenon of an opening in the earths surface through which a jet of hot water and steam is forced out at regular interval is called