Which of the following is true?
A) Humid tropical soils are resistant to weathering.
B) Arid region soils are high in soluble materials.
C) Mid-latitude humid soils are oxisols and ultisols.
D) Mid-latitude subhumid soils include mollisols.
Answer: B
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Using this plot of annual peak discharge, which of the following sizes of flood is most likely to be exceeded in any given year?
A) 4,000 cubic meters per second
B) 1,000 cubic meters per second
C) 200 cubic meters per second
D) 100-year flood
Can other conventional fossil fuels, such as natural gas and coal, replace oil?
a. Probably yes, because natural gas and coal are relatively abundant. b. Not yet, because the natural gas is expensive to extract and transport, and some coal deposits are too deep to mine.
What does the Coriolis effect do?
What will be an ideal response?
Current levels of atmospheric carbon dioxide are
A) remaining high but steady. B) nearly 400 ppm, higher than they have been in 800,000 years. C) fluctuating greatly but are starting to increase again after a downward trend in the 1990s. D) decreasing because surplus carbon dioxide is being absorbed by the arctic permafrost.