. "??? ??? ??? landform a shape of the land such as a mountain, plain or plateau ??? ??? ??? volcano a mountain formed by hardened lava with an opening through which lava, ashes, rocks and other materials may come out ??? ??? ??? earthquake the shaking of the ground caused by rock movement along a fault ??? ??? ??? fault a crack in the earth's crust along which rocks move. ??? ??? ??? erosion the mov" . . . .