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.

Mantle convection is the process that drives plate tectonics. the theory of plate tectonics states that the crust is divided into plates that float on the semi molten mantle below. the circular motion of the magma as it slowly rises and falls or move though convection cells drags the plates along causing them to move. the heat source in the lamp would represent the earth's core. the core is the source of energy that drives convection in the mantle. the lava represents molten magma under the earth's surface. if the lava lamp had floating pieces they would move as the circular motion of the lava in the lamp as it rises and falls would move them along the surface. these floating pieces would represent pieces of the earth's crust. 

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