The Democratic Republic of Congo, Congo, Burundi, Chad, and Rwanda rely on links to the rest of the world via
A. the Nile River
C. the Tanzam Railway
D. Saharan caravan routes
B. the Congo River
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Which of the following reduces the risk of heart disease and colon cancer, maintains joints and tendons, and reduces depression, stress, and anxiety?
A. exercise B. metabolic syndrome C. insulin resistance D. desk jobs, television, and the Internet
Covalent bonds are found in quartz. What could this suggest about its physical properties?
A) It is a harder mineral. B) It is purple. C) It is malleable. D) It is a conductor of electricity.
If a rock is exposed to such high temperatures that it melts, it forms a(n) ____________________ and
becomes a(n) ____________________ rock. Fill in the blank(s) with the appropriate word(s).
Which parameter makes it possible to determine the direction groundwater is flowing in the subsurface?
A. Hydraulic porosity B. Hydraulic gradient C. Hydraulic conductivity D. Hydraulic pressure