1) There are 3 main sectors in any economy : the primary,the secondary,the tertiary sectors.
2)The primary sector includes industries that get goods from nature, such as agriculture and mining.
3) Because mineral resources need industrial processing.
4)Manufacturing industries which produce goods by means of mechanical,electrical and chemical processing of resoures belong to the secondary sector.
5)Manufacturing industries which produce goods manual do not belong to the secondary sector.
6)The tertiary sector provides different services to consumers,such as trade,transport,banking, and others.
7) There is tendency for the growth of the service sector in many economies,especially in industrialized countries.