social studies test - geography\nquestions 8 ...

social studies test - geography\nquestions 8 through 10 refer to the following paragraph and line graph on world population growth.\ndemographers are scientists who study and analyze population data. they also forecast future population based on past growth rates and estimates of future growth rates. world population from 1950 to 2050 is shown in the following graph.\n8. according to the graph, approximately what will the world population be in 2030?\n(a) 4 billion\n(b) 6 billion\n(c) 8 billion\n(d) 12 billion\n9. in 1960, the world population was about 3 billion. how many years did it take for the population to double?\n(a) 10 years\n(b) 20 years\n(c) 30 years\n(d) 40 years\n10. suppose that new data indicates the spread of aids will cause world population to grow more slowly than previously forecast over the next forty years. based on this prediction, how would the line graph for world population from 1950 - 2050 change?\n(a) the part of the graph showing 1950 - 2010 would stay the same; the part of the graph showing 2010 - 2050 would be less steep.\n(b) the part of the graph showing 1950 - 2010 would stay the same; the part of the graph showing 2010 - 2050 would be steeper.\n(c) the part of the graph showing 1950 - 2010 would be less steep; the part of the graph showing 2010 - 2050 would stay the same.\n(d) the part of the graph showing 1950 - 2010 would be less steep; the part of the graph showing 2010 - 2050 would be steeper.\nsource: international data base, u.s. bureau of the census

Answer

# Brief Explanations: 8. By observing the graph, the world population in 2030 is approximately 8 billion. 9. The world population was about 3 billion in 1960 and about 6 billion around 2000, so it took 40 years to double. 10. Since the new data indicates slower population - growth in the next forty years (2010 - 2050), the part of the graph showing 1950 - 2010 which is based on past data would stay the same, and the part showing 2010 - 2050 would be less steep. # Answer: 8. C. 8 billion 9. D. 40 years 10. A. The part of the graph showing 1950 - 2010 would stay the same; the part of the graph showing 2010 - 2050 would be less steep.