geological phenomenon

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WordNet Dictionary
	Definition:		[n]  (geology) a natural phenomenon involving the structure or composition of the earth
	See Also:		alluvial cone, alluvial fan, alluviation, alluvion, cataclysm, catastrophe, continental drift, deluge, deposit, earthquake, flood, frost heave, frost heaving, inundation, natural phenomenon, quake, sedimentation, seism, temblor, transgression, volcanism