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

Environmental & Atmospheric Sciences

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