Ais a count of the population in particular areas

Census.

Explanation:

A census is a process of data collection and is the systematic acquisition of data about the given population and united state describe the essential feathers of the population density and the sex ration and is also based on the sampling methods of data collection. Done so that the population can be mapped and studied according to the changing nature of the population as to study their distribution and other associated characteristics.

Don’t use up to much of them it leads to pollution

Earthquake waves that vibrate from side to side and up and down only through solids are known as "seismic waves."hope my answer has you : )