What do you think are the reasons of migration and its impact on the migrating people?

What do you think are the reasons of migration and its impact on the migrating people? Name two metropolitan cities facing this problem.
Ans. The reasons of migration are
(i) Lack of employment opportunity.
(ii) Landlessness.
(iii) Lack of educational and health facilities.
The impact of migration on the migrating people are
(i) Homelessness and forced to live in unhealthy slum areas.
(ii) Unemployment
(iii) Unavailability of basic needs like proper sanitation, electricity and water supply.
Two metropolitan cities of India are Delhi and Mumbai which are facing all these problems.