For geographers, the movement of higher-income residents and businesses into poor areas of inner cities is generally referred to as a. urban revitalization. b. gentrification. c. restoration. d. urban development.

For geographers, the movement of higher income residents and businesses into poor areas of inner cities is generally referred to as gentrification resulting to the increase of rents and the values of properties and the changes in the culture and the character of the district. This term has a negative connotation for others since it implies the displacement of the marginal communities by the richer ones. However, the effect of this gentrification is hard to measure and varies from one situation to the other.

The answer is the magnetosphere.