Demographers estimate the human population in 2050 to be between 7.8 and 10.8 billion-a range of three billion. Why is the estimated range so wide?
A. More-developed countries routinely inflate their estimates.
B. Projections are made by a variety of organizations.
C. Fertility rates are calculated with a standard formula by country.
D. Ranges include maximum and minimum estimated casualties of war.
E. Statistics regarding drought and famine are constantly shifting.
Answer: B
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A) become a maritime polar (cP) air mass. B) become a continental tropical (cT) air mass. C) remain a maritime tropical (mT) air mass. D) become a maritime polar (mP) air mass.
Which of the following rocks is composed of only a single mineral?
A) Limestone B) Granite C) Conglomerate D) Gabbro
Subaerial geomorphic processes are defined as ________
Fill in the blank(s) with the appropriate word(s).
A cultural region is, by definition, contiguous with no discontinuous sections
Indicate whether this statement is true or false.