SCIENCEUNIT 12SOCIETY

• PopulationThe population of a place changes continuallybecause of the birthrate, the death rate, emigration and immigration.

The birth rate is the number of people born in a place every year. The death rate is the numberof people who die in a place every year.

The natural growth rate is the differencebetween the birth and death rates. It can be positive or negative.

We obtain the real growth rate by adding and subtracting immigration and emigration to thenatural growth rate.

• The population of SpainThe population of Spain has increased a lotbecause of a decrease in the death rate and anincrease in the rate of immigration.

Population density in Spain

Population density tells us if a territory has a lotof inhabitants or a few. We calculate it bydividing the number of inhabitants of theterritory by the surface area of the territory.

Spain has population density of 90 inhabitantsper square kilometre.

Population distribution in Spain

Lesson vocabularyPopulation: población

To change: cambiar

Birth rate: tasa de natalidad

Death rate: tasa de mortalidad

To die: morir

Natural growth: crecimiento natural

Real growth: crecimiento real

To add: sumar

To subtract: restar

To increase: aumentar

To decrease: disminuir

Density: densidad

To tell: decir

Inhabitant: habitante

Per square kilometre: por kilómetro cuadrado