Which of the following are pulsating stars used to determine the dimensions of the Universe?
A. red dwarfs
B. supernovas
C. cepheid Variables
Answer: C
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Which of the following is a common, approximate value for the angle of repose of rock particles?
a. 3? b. 13? c. 33? d. 73? e. 133?
The map below uses what type of map projection?
A. conical B. sinusoidal C. cylindrical D. planar
What region borders the Sahara Desert, has highly variable rainfall and a human population dependent on pastoralism?
A) West Africa B) East Africa C) Horn of Africa D) Central Africa E) Sahel
In the Demographic Transition Model which of the following statements is TRUE?
A) Stages 1 and 4 both have low death rates B) Stage 1 has a low birth rate but a high death rate C) Stage 4 has a low RNI D) Stage 3 has a lower birth rate than death rate E) Stage 2 has a low RNI