Four of the following are benefits that coral reefs provide. Which one is the exception?
A. They provide significant free oxygen.
B. They serve as natural barriers.
C. They protect coastlines from erosion.
D. They provide habitats for one-quarter of all marine organisms.
E. They provide one-tenth of the global fish catch.
Answer: A
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Twenty centimeters of precipitation fell in one day on a southern city in the 100-years climatic records for this city. This rainfall event ranked fifth among all one day precipitation events for this city. The return period for this extreme rainfall event would be
A) 4 years. B) 5 years. C) 20 years. D) 100 years.
What is the average pH of the ocean?
A) 7.0 B) 7.5 C) 8.0 D) 8.5
A derecho
A) occurs only in the Southwest. B) lasts from a few seconds to a few minutes. C) is associated with severe thunderstorms. D) has mild to moderate winds. E) does not cause property damage.
When the circle of illumination just touches the Arctic Circle and the North Pole is dark, the date is closest to ________
A) March 23 B) June 21 C) September 23 D) December 21 E) July 4