a shape of the land such as a mountain, plain or plateau
a mountain formed by hardened lava with an opening through which lava, ashes, rocks and other materials may come out
the shaking of the ground caused by rock movement along a fault
a crack in the earth's crust along which rocks move.
the moving of weathered rocks and soil by wind, water or ice
a pile of sand formed by the wind
nonliving solid matter from the earth
the breaking and changing of rocks