Encyclopaedia of World Civilizations (In 3 Volumes)

Earth is millions of years old and when human life came on earth surface opinions about this radically differ. Several legends about origin of the world and life have been given in religious books but so far scientifically none has proved true. Even the geologists, geographers, scientists and historians have so far not been in a position to say that confidence about the origin of life on earth. Thus, so far our knowledge about history of nations and mankind is imperfect. It is rather based on guess work. Not much authentic and reliable evidence is available about origin of world. It is however, believed that life gradually came on earth and that human civilization too gradually evolved. Each nation has its own culture and civilization of which it not only feels proud but it also wishes to preserve that at all costs. History of world civilization began with the coming of man on the surface of the earth. Beginning was made with the man of old stone age. Some changes in making of tools, ways of hunting, methods of living and cultivation etc. came during new stone age period. All old civilizations like Greek, Indus, Mesopotamian etc. developed near the river valleys because of several reasons. Each civilization had its own peculiar features, reasons for its quick spread and also for its down fall.