The accompanying graph shows the number of Atlantic hurricanes since the 1880's. Based on when most global warming has occurred, one would conclude
A. all hurricanes have increased in frequency.
B. no trends are apparent from this graph.
C. short duration hurricanes have increased in frequency.
D. moderate duration hurricanes have increased in frequency.
Answer: C
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Geologists know that radioactive dating methods are valid
A) because they are consistent with proposed theories. B) because they have been compared with dates determined by other methods and have been found to correlate well. C) because they have been compared with dates determined by other methods and have the same exact dates. D) because the instruments always work well when performing laboratory tests.
Lee-side lows are
a. storms (extratropical cyclones) that form on the eastern (lee) side of a mountain range. b. thermal lows that form due to surface heating over deserts. c. storms (tropical cyclones) that form near the Leeward Islands. d. low pressure areas that form over oceans, then move onshore of the lee side of the coastline. e. storms that form on the lee side of lakes.
The use of strip cropping helps to control soil erosion by
A. reducing leaching. B. increasing the cation exchange capacity. C. increasing saltation. D. reducing runoff.
Coal is still an important fuel in the United States, mainly used for producing electricity today
Indicate whether this statement is true or false.