How often is there a census to adjust the number of seats in the house of representatives

"Apportionment" is the process of dividing the 435 memberships, or seats, in the House of Representatives among the 50 states. The Census Bureau conducts the census at 10-year intervals.

Explanation:

map scale refers to the relationship (or ratio) between distance on a map and the corresponding distance on the ground. for example, on a 1: 100000 scale map, 1cm on the map equals 1km on the ground.