billion year 6 billion year 8 Use your estimations from above to determine the

# Billion year 6 billion year 8 use your estimations

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4 billionyear________6 billion year________8. Use your estimations from above to determine the doubling time:from 1 to 2 billion? __________from 2 to 4 billion? __________from 3 to 6 billion? __________9. Has a doubling of world population occurred in your parents’ lifetime? 10. Look at the chart of Population Growth in Selected Countries found below the previous data on the excel spreadsheet.. Fill out the chart in the following way:a)The Natural Increase is the % increase per year. To calculate it, subtract the death rate from the birth rate and divide by 10. b)Now calculate the doubling time by using the “Rule of 70”Doubling Time = 70/ Natural Increase 11. a) What country has the greatest rate of population growth?_________ What is the rate? _______% per yeara)What country is closest to zero population growth?_____________b)What is the doubling time for the United States?_________yearc)The birth rates and death rates that are given are per 1000 people in one year. The United States is actually growing faster than its natural increase. The United States, with its open immigration policy, accepts 5 immigrants per thousand each year. Add 5 to the birth rate to show the increase due to immigration. a.What is the doubling time?___________years. d)Check to see if the “Rule of 70” actually works. Look up the population and% increase for 1952 in the World Population and Annual Addition, 1950-2007 chart. population = ______________ annual addition = _____________Natural rate of Increase (%)=___________using the “Rule of 70” calculate the doubling time=_________What year should the population be double?__________ 31