Land is used for various purposes, such as cultivation of crops, building of houses, construction of roads and railways, grazing of animals, etc. This is commonly known as land use pattern. The percentage of land used for various purposes varies from one region to another. The utilisation of land is determined by the continuous interplay of the physical factors, such as relief, soil, climatic conditions, mineral resources, etc., and the human factors like density of population and the technological and social requirements of people.