The discipline which would be responsible for collecting data about currents and tides is oceanography. It is a study of all the changes and aspects of the ocean. It analyses, collects and monitors information that refers to the dynamic of all the natural processes that take place in the ocean, including ocean currents, waves, and geophysical processes.
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This is so since the average person (with activity) stores enough glycogen to last him 12 to 14 hours.