volcano - a mountain made from hardened lava, rocks, and ash that erupted from underneath the Earth's surface, earthquake - the shaking of the Earth's crust caused by large pieces of rock underneath the Earth's surface moving against each other, landslide - occurs when gravity pulls down some of the land on the slope of a hill, weathering - the breaking down of rock on the surface of the Earth, usually by the force of wind, water or ice, erosion - the movement of weathered particles by water, wind or ice, canyon - the high wall salong a river and the river itself, glacier - a huge piece of ice that slowly moves across the surface of the Earth and remains frozen during the entire year, deposition - the process by which materials that have been eroded are dropped in a new place, delta - a large, flat area of land at the mouth of a river formed by the deposition of sediments , sand dune - a hill of sand formed by the deposition of sand by the wind,

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