Tide

Tides are the periodic rise and fall of sea level resulting from the differential gravitational forces exerted primarily by the Moon and the Sun, combined with inertial effects associated with the Earth–Moon system’s orbital motion and the Earth's rotation.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 3.0

SHIPSKIN

Marine coatings, hull protection, and the calculators behind a well-painted vessel.

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