Explanation:

Internal migration does not change the size of the population, but influences the distribution of the population within the nation. Migration is the cause of natural disasters, poor housing, lack of money, studies or job opportunities. Internal migration or domestic migration is human migration within one geopolitical entity, usually a nation-state. Internal migration tends to be travel for education and for economic improvement or because of a natural disaster or civil disturbance. Cross-border migration often occurs for political or economic reasons. A general trend of movement from rural to urban areas, in a process described as urbanization, has also produced a form of internal migration.