USCG Exam Practice · Tides and currents — predictions and corrections
Tides are caused primarily by which of the following?
- AWind-driven surface currents acting on coastal landmasses
- BThe gravitational interaction of the moon, sun, and earth✓ correct
- CDifferences in water density due to temperature and salinity
- DAtmospheric pressure variations over the ocean surface
Why B is correct
Bowditch Ch. 9 §901 defines tides as the periodic vertical rise and fall of sea level due to the gravitational interaction of the moon, sun, and earth. Wind-driven currents, density differences, and atmospheric pressure are separate phenomena not identified as the cause of tides in the source.
Cited:Bowditch Ch. 9 §901
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