What usgs stand for and what do they do? The United States Geological Survey/service were and are the cartographers that converted early maps into the GPS location system known today. Edit
Medical Definition of EGOCENTRIC. 1. : limited in outlook or concern to one's own activities or needs.
Ego In Freudian theory, a concept referring to the conscious, rational part of the personality structure, which mediates between the impulses of the id and the rules of society. Elderly dependency ratio The ratio between the number of the elderly (65 and over) and the number of working-age people (ages 18 to 64).