The largest city and financial and transportation hub of southern Africa is
A) Addis Ababa
B) Bamako
C) Kinshasa
D) Johannesburg
E) Nairobi
D) Johannesburg
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What are the maximum and minimum temperature anomalies recorded? What is the range of temperature anomalies in the Vostok record?
Examine Figure 18.2. The Vostok ice core is 3310 m (10,860 ft) long. The full record extends back to 422,000 years before the present. The figure shows CO2 in parts per million (ppm) and temperature anomalies in Celsius degrees. What will be an ideal response?
Why does a plume of contamination spread out (become wider) away from the source of contamination?
A) Because the water flows faster and faster
B) Because of diffusion of the contamination and mixing of contaminated and uncontaminated water
C) Does not spread out away from the source
D) Will only spread out if it is close to a cone of depression
Many experts think that in the future, water conflicts will be a major cause of international conflict. Currently, however, there are no international conflicts over water.
Answer the following statement true (T) or false (F)
In the 1930s, the ratio of retirees to working people was about 1:30, whereas today it is about what?
A) 1:20 B) 1:8 C) 1:40 D) 1:3