The areas shown that suffer from oxygen depletion are victims of
1.iron pollution that forms rust with the oxygen.
2.higher than average rates of primary production.
3.lower than average rates of primary production.
4.reduced wave action.
2
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The newly-formed Earth’s atmosphere was very different from Earth’s current atmosphere because it had ____
a. an abundance of mercury vapor b. an enormous amount of carbon dioxide, resulting in very hot temperatures due to greenhouse effect c. virtually no oxygen, a necessary component for the existence of animal life d. an enormous amount of methane and ammonia, which was never lost by the atmospheres of the outer planets e. virtually no nitrogen, the major component of today’s atmosphere
Global climate models differ from numerical weather forecasting in that GCMs
A) only focus on the atmosphere. B) make definitive predictions about future weather at specific locations for specific times. C) cannot be proven correct or incorrect for several decades. D) use mathematical models. E) use sophisticated computers.
Currently, the number of years required for the world's population to double is approximately:
A. 53 years B. 73 years C. 43 years D. 13 years E. 93 years
Some basins in the desert southwest were filled with water during the last glacial period.
Answer the following statement true (T) or false (F)