What is one of the newest techniques employed to measure tides?
a. Using simple drogues
b. Using pressure-sensing transducers
c. Using drift bottles
d. Using variations in Earth's magnetic field
ANS: D
The magnetic field of Earth has slight variations due to the interference of tides. The flow of tides on
Earth produces a secondary magnetic field that interferes with the main magnetic signature. These
variations are measured by satellites. Information can be found in the section Contemporary
Oceanography Makes Use of Modern Technology
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