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Urban areas may be cities, towns or conurbations, but the term is not commonly extended to rural settlements such as villages and hamlets. Urban areas are created and further developed by the process of urbanization. Measuring the extent of an urban area helps in analyzing population density and urban sprawl, and in determining urban and rural populations...

Martin Rietze is an amateur photographer who became famous for the fact that he takes volcanoes photos in different parts of the world. The photographer was able to capture electrical discharges during eruptions, which are interested in the scientific community. Martin Rietze was born in Fuerstenfeldbruck near Munich in June 1964. During the school time and the study of electrotechnology in Munich his interests increased in astrophotography and climbing mountaineering...