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If an area's total population remains the same but habitable land decreases, what will happen to effective population density?

Answer and explanation

Correct answer: Density will increase

Correct answer: A. Density is calculated by dividing population by the area being considered. If the population stays constant while the habitable or usable area becomes smaller, the same number of people is associated with less land. The denominator of the ratio falls, so the effective density rises. For example, if 1,000 people occupy 100 usable square kilometres, the density is 10 people per square kilometre; if only 50 square kilometres remain usable, it becomes 20 people per square kilometre. A is correct because it reflects this ratio. B would be true only if the usable area increased while population stayed fixed. C is wrong because people have not disappeared. D is wrong because the measure remains possible when the relevant usable area is known. Do not confuse total geographical area with habitable area in this question.

Related tags

Effective DensityHabitable LandDensity FormulaPopulation DensityPopulationGeographyClass 9 Mcq

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