Along the Gulf and Atlantic coasts, on the average, about five hurricanes make landfall every three years, two of which are major hurricanes with winds in excess of 95 knots (110 mi/hr). However, the number of hurricanes in the North Atlantic varies greatly from year to year and even decade to decade. The activity appears to be enhanced for periods of roughly 25 to 35 years in connection with the
warm phase of the ____________________, which influences water temperatures in the tropical North Pacific where hurricanes most often develop.
Fill in the blank with correct word.
ANSWER: ?Atlantic Multidecadal Oscillation
AMO
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Magnetic reversals ____
A)occur in a matter of months B)occur when magnetic north and magnetic south poles switch positions C)have no affect on iron-bearing minerals D)are very well understood and can be predicted E)cause seafloor spreading to reverse directions
Which of the following is the characteristic feature of all alkynes?
A) the presence of one or more carbon-carbon double bonds B) the presence of one or more carbon-carbon triple bonds C) the presence of at least one carbon-carbon double bond, and at least one carbon-carbon triple bond D) the presence of a ring system
With reference to mid-latitude cyclones in the Northern Hemisphere
A) there are more and weaker cyclones than in the Southern Hemisphere. B) there are more and stronger cyclones than in the Southern Hemisphere. C) there are fewer and weaker cyclones than in the Southern Hemisphere. D) there are fewer and stronger cyclones than in the Southern Hemisphere.
Which of the following is NOT one of the environmental problems of South Asia?
A) flooding of the river deltas B) deforestation C) air pollution D) acid rain E) water pollution