Within ENSO, the Walker circulation is ________
A) the pattern of air flow across the South Pacific
B) the deep ocean current across the South Pacific
C) not present when El Niño is at its maximum
D) the changing phase of the Arctic oscillation
E) the newest scientific discovery
Answer: A
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Which of the following gases is responsible for the greenhouse effect on Venus?
A. ozone B. nitrogen C. carbon dioxide D. oxygen
Generally speaking, the average crustal concentration of one metal has what kind of relationship with the minimum concentration factor of this metal for profitable mining?
a. Not related b. Positively related c. Negatively related d. The relationship changes among metals
Which of the following is most important to shoreline erosion?
A) Air forced into cracks in rocks B) Abrasion by water-carried materials C) Solution of rocks D) Crystallization of salts in rock crevices and pores E) Waves
The continents are the lightest part of Earth's crust.
Answer the following statement true (T) or false (F)