A hypothesis is presented, qualified, and then reaffirmed.
26. The passage suggests that which of the following would be true if the oceans circulation consisted primarily of large, slow-moving currents?
The influence of mesoscale fields on global weather patterns would remain the same.
Large-scale currents would exhibit more variability than is actually observed.
The majority of the oceans kinetic energy would be derived from mesoscale fields.
Atmospheric-oceanic disturbances such as El Nino would occur more often.
Conventional measuring techniques would be a feasible method of studying the physical properties of the ocean.
27. Which of the following, if presented as the first sentence of a succeeding paragraph, would most logically continue the discussion presented in the passage?
Timekeeping in medical tomography must be precise because the changes in travel time caused by density fluctuations are slight.
To understand how ocean acoustic tomography works, it is necessary to know how sound travels in the ocean.
Ships are another possibility, but they would need to stop every 50 kilometers to lower measuring instruments.
These variations amount to only about 2 to 3 percent of the average speed of sound in water, which is about 1, 500 meters per second.
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