(a)  Physical environment

Major changes in the physical environment are very compelling when they happen. The desert wastes of North Africa were once green and well populated. Climates change, soil erodes and lakes gradually turn into swamps and finally plains. A culture is greatly affected by such changes although sometimes they come about so slowly that they are largely unnoticed. Human misuse can bring very rapid changes in physical environment which in turn change the social and cultural life of a people. Deforestation brings land erosion and reduces rainfall. Much of the wasteland and desert land of the world is a testament to human ignorance and misuse. Environmental destruction has been at least a contributing factor in the fall of most great civilization. Many human groups throughout history have changed their physical environment through migration. In the primitive societies whose members are very directly dependent upon their physical environment migration to a different environment brings major changes in the culture. Civilization makes it easy to transport a culture and practice it in a new and different environment.

(b)  Demographic factor

A population change is itself a social change but also becomes a casual factor in further social and cultural changes. When a thinly settled frontier fills up with people the hospitality pattern fades away, secondary group relations multiply, institutional structures grow more elaborate and many other changes follow. A stable population may be able to resist change but a rapidly growing population must migrate, improve its productivity or starve. Great historic migrations and conquests of the Huns, Vikings and many others have arisen from the pressure of a growing population upon limited resources. Migration encourages further change for it brings a group into a new environment subjects it to new social contacts and confronts it with new problems. No major population change leaves the culture unchanged.

(c)  Isolation and contact

Societies located at world crossroads have always been centers of change. Since most new traits come through diffusion, those societies in closest contact with other societies are likely to change most rapidly. In ancient times of overland transport, the land bridge connecting Asia, Africa and Europe was the centre of civilizing change. Later sailing vessels shifted the centre to the fringes of the Mediterranean Sea and still later to the north- west coast of Europe. Areas of greatest intercultural contact are the centers of change. War and trade have always brought intercultural contact and today tourism is adding to the contacts between cultures says Greenwood. Conversely isolated areas are centers of stability, conservatism and resistance to change. The most primitive tribes have been those who were the most isolated like the polar Eskimos or the Aranda of Central Australia.