A civilization or civilisation is any complex society characterized by urban development, social stratification imposed by a cultural elite, symbolic systems of communication, and a perceived separation from and domination over the natural environment. Civilizations are intimately associated with and often further defined by other socio-politico-economic characteristics, including centralization, the domestication of both humans and other organisms, specialization of labour, culturally ingrained
elevation noun [C/U]. âº âheight above the âsurface of the âearth, or an âarea that is âhigher than the âsurrounding âland: [C] At âhigher elevations, the âair is âcolder. (Definition of elevation from the Cambridge Academic Content Dictionary Â© Cambridge University Press).
Angles of Elevation and Depression The angle of elevation of an object as seen by an observer is the angle between the horizontal and the line from the object to the observer's eye (the line of sight). If the object is below the level of the observer, then the angle between the horizontal and the observer's line of sight is called the angle of depression. From the top of a vertical cliff 40 m high, the angle of depression of an object that is level with the base of the cliff is 34Âº.