Although the majority of South Africa was black, whites had exclusive control of the politicaland economic systems for a long time.Who was the first black South African president?
a. Haile Selassie
b. Nelson Mandela
c. Joseph Kabila
d. Frederik de Klerk
e. Mobutu Sese Seko
b
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Regularly providing food to regions with chronic hunger in developing countries can aggravate the problem of food supplies by
A) changing the types of native foods consumed by the local people. B) causing nutritional deficiencies associated with a new type of food. C) causing overnourishment and the health problems associated with obesity. D) decreasing the local production of food and disrupting the local economy.
Simple pumping gets only about 30% of the oil in a reservoir rock out of the ground. To increase the pumping/recovery rate, what kind of secondary recovery technique can be used?
a. Force the steam into the ground nearby (the steam heats the oil in the ground, making it less viscous) b. Use new drill bits c. Hydrofracturing (or fracking) d. Use a more powerful pump e. Both a and c
A city park and a freshwater lake are examples of ____________________ that are vulnerable to non-native species and pollution.
Fill in the blank(s) with the appropriate word(s).
Since 1976, the EPA has used the Toxic Substances Control Act to ban only 5 of the roughly 85,000 chemicals in use.
Answer the following statement true (T) or false (F)