Deep ocean water can be enriched in oxygen when it is mixed with surface water.
a. true
b. false
Answer: a. true
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The general chemical equation for photosynthesis is shown below. Through this reaction, is the carbon oxidized or reduced? How can you tell? 6 CO2 + 6H2O ? C6H12O6 + 6 O2
A. Reduced, since in carbon dioxide there are two oxygen atoms for every one carbon, but within the product, C6H12O6, (glucose), there is only one oxygen for every one carbon. B. Oxidized, since carbon is in the +4 oxidation state in CO2 but in the +6 oxidation state in the product, C6H12O6, glucose. C. Neither, since carbon does not change its oxidation state and is neither oxidized nor reduced. D. Both, since the carbon atoms within the glucose molecules display two different charge states.
Relative to the A horizon, the B horizon of soil should have:
c a. low clay and high organic matter content b. high clay and high organic matter content c. high clay and low organic matter content d. low clay and low organic matter content
Which of the following is an example of a special interest group?
A. Nongovernmental organizations B. Scientific research groups C. Politicians D. Government agencies E. Economists
What would have happened to the earth if the Sun were significantly larger than it is?
A) Liquid water and the water cycle would not exist. B) Our atmosphere would consist mainly of carbon dioxide. C) Our atmosphere would consist mainly of nitrogen. D) Our Sun would have burned out after a few hundred million years so life would not evolve.