a. 4 million.
b. they use the land extensively rather than intensively.
c. the collapse of the Roman Empire and famine and floods in China.
b. an increase in the birth rate
c. 1 billion.
6. Current projections from the United Nations suggest that we could reach a population of 10 billion by approximately a. 2020. b. 2040. c. 2060. d. 2080.
c. 2060
. The total population of the world is currently increasing by about _____ million people per year.
a. 20
b. 40
c. 60
d. 80
d. 80
a. death rates were very high.
d. the decline in the death rate.
d. Europe.
c. 60 billion.
a. 35; 16
13. The five most populous countries in the world account for about \_\_\_\_ percent of the world’s total population. a. 10 b. 25 c. 50 d. 70
c. 50
a. Nigeria.
b. European countries are aging.
d. Indonesia.
b. East Asia.