The conversion of nitrates into free nitrogen ________
A) does not happen in nature
B) is called freeing of nitrogen
C) is accomplished by bacteria
D) happens in the process of photosynthesis
E) is little impacted by humans
Answer: C
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Water vapor is
A) a collection of tiny liquid particles. B) an invisible gas. C) sometimes a liquid and sometimes a gas. D) considered an aerosol. E) seldom present below the base of the lowest layer of cloud.
There is less biomass per unit volume available for harvesting in the open ocean, as compared to upwelling and coastal zones, because ________.
A. there are less nutrients B. the temperature is lower C. the salinity is greater D. there is less oxygen E. All of these are correct.
A speed of ________ kilometers per hour (miles per hour) is typical of the movement of a middle latitude cyclone across the landscape
A) 10 B) 20 C) 40 D) 60 E) 80
Asteroids are concentrated in the Oort Cloud, beyond Neptune
Indicate whether the statement is true or false