Noun | 1. | geological phenomenon - a natural phenomenon involving the structure or composition of the earth geology - a science that deals with the history of the earth as recorded in rocks earthquake, quake, seism, temblor - shaking and vibration at the surface of the earth resulting from underground movement along a fault plane of from volcanic activity natural phenomenon - all phenomena that are not artificial endogeny - a geological phenomenon below the surface of the earth alluvial cone, alluvial fan - a fan-shaped deposit where a fast flowing stream flattens out cataclysm, catastrophe - a sudden violent change in the earth's surface continental drift - the gradual movement and formation of continents (as described by plate tectonics) flood, inundation, alluvion, deluge - the rising of a body of water and its overflowing onto normally dry land; "plains fertilized by annual inundations" frost heave, frost heaving - upthrust of ground or pavement caused by the freezing of moist soil transgression - the spreading of the sea over land as evidenced by the deposition of marine strata over terrestrial strata volcanism - the phenomena associated with volcanic activity |