AP ENVIRONMENTAL



19050-1905004819650-9525Name______________________________________The graph below represents the entire world population, sorted by age and gender, with the youngest at the bottom and the oldest at the top. Each age level grouping is called a cohort.Part 1:You group will be assigned one of six countries. _________________________________________The figures on the chart represent the population (in thousands) of each age group within each gender for each particular country. In order to construct the country’s pyramid, you must first calculate the percentage of the population of each gender in each age group.On the graph provided, construct a population pyramid as in the example. Using colored pencils, shade in the two sides of your graph.Describe the population pyramid of your country. 4747260-114300The annual population increase throughout the world is currently 1.2%. This figure is derived from the world’s birth rate (the number of births per 1,000 people) and death rate (the number of deaths per 1,000 people). While this number may sound small, today’s population would double in just 58 years if we continue to grow at this rate. This growth is by no means uniform. At current rates, many countries will double their populations in less than 25 years, while others have reached zero population growth (ZPG) – a state when the birth and death rates are roughly equal – and do not expect to grow at all. Some countries are seeing negative population growth (NPG), when the birth rate is lower than the death rate. Determine the rate of annual increase for your assigned country using the following formula:266700952505229225146685Based on the rate of natural increase, you can now determine your country’s population doubling time with the following formula:26670077470CountryBirth RateDeath RateAnnual Natural Increase (%)Doubling Time (years)United States148Mexico205China127France138Nigeria4115India237Part 2:Share your population pyramid with your new group, describing the trends. Then answer the following questions:Can you tell from the data if there are more boy babies or girl babies in each country?Are there more elderly women or men? Why might that be the case?Can you tell from the graphs which country has the most people?Of the six graphs, which look most like pyramids? What does that indicate about their population growth rates? What factors would change the shape of the pyramids in the future?Looking at the pyramids, which countries appear to have the slowest rates of population growth? How can you tell?What are the biggest age groups in the United States? Why?In which country do children make up the biggest percentage of the population?Some cultures have traditionally favored boy children over girl children (as can be seen as in the pyramids for India and China). Why might it be advantageous to have boys rather than girls in these countries? What are some consequences that may arise if a generation has a gender imbalance?How would you expect the Mexican pyramid to look if you graphed it 40 years from now?Share your country’s annual natural increase and doubling time with your group. Then answer the following questions:Which figures differ most greatly between countries, the birth rates or the death rates? How would you explain the wide disparity among different countries?What do you think accounts for variations in the death rate between countries? For example, the death rate in Mexico is 5 per 1000 while the death rate in the US is 8 per 1000.Russia has a CBR of 12 and a CDR of 15. Calculate the annual natural increase. Is Russia likely to run out of people? Why or why not ................
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