The number of valence electrons of a main group element is related to which of the following?
A) the element's atomic number
B) the element's atomic weight
C) the element's column number
D) none of the above
C
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Oscillations in temperature and ice cover are known as __________________.
What term is used to describe the exclusive microecosystem picoplankton have been discovered to operate in?
a. "picoplankton economy" b. "microecosystem economy" c. "phytoplankton economy" d. "official economy"
e. "black market economy"Which of the following most accurately describes cropland trends in the United States and China?
A) China's population boom has resulted in a recent increase in cropland acreage, while cropland acreage in the United States has stabilized. B) Both countries are increasing in cropland acreage to support their growing populations and to maintain a growing export industry. C) The amount of land in crop production has stabilized in both countries despite the fact that both countries are increasing in population. D) The amount of land in crop production is decreasing in both countries despite the fact that both countries are increasing in population.
The movement of air across the ocean surface creates ________ waves
A) atmospheric B) ocean C) splash D) tidal E) turbidity