[3] The northern and north-eastern states along the Himalayas contain cold arid deserts with fertile valleys.
These states have relatively low population density due to indomitable physical barriers.
[8] India has 641,000 inhabited villages and 72.2 percent of the total population reside in these rural areas.
[10] In the decade of 1991–2001, migration to major cities caused rapid increase in urban population.
[7] States such as Punjab, Haryana, Himachal Pradesh, Gujarat, Tamil Nadu, Mizoram and Andaman and Nicobar Islands recorded an increase in India's child sex ratio.