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The population pyramids represent
the structure of a population according to age and sex.
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eraser
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star
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rocket
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thief
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monster
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gold
Win 50 points!
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shark
Other team loses 25 points!
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lifesaver
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15
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Population density is calculated
by dividing the total number of people in an area by the area they occupy (in km²).
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The evolution of the population in Spain during the 100 years was due to:
- The fall of death rates.- The increase in life expectancy.- The large increase in birth rates during the baby boom of the 1960s and 1970s.
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Is world population evenly distributed?
The world population is not evenly distributed since there are areas with high population density and areas with low population density
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There are two types of migratory movements:
emigration and immigration.
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The factors that motive migrations can be:
economic reasons, warlike conflicts, natural disasters (earthquakes, floods, droughts, etc.), political, religious and ethnic persecutions, humanitari...
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eraser
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gift
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fairy
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banana
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Emigration
is the departure movement of population from one place to another.
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Constrictive pyramids
It represents populations in process of ageing. They are typical of developing countries.
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Immigration
is the arrival movement of population from one place to another.
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Expansive pyramids
It represents young populations. They are typical of underdeveloped countries.
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The Spanish population pyramid is
stationary ( due to the low birth rate and the increase in life expectancy. It an elderly population.
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How many people are there in the world?
The world´s population is approximately 7 billion
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The birth rate depends on
the fertility rate
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