Earth tide or body tide is the displacement of the solid Earth's surface caused by the gravity of the Moon and Sun. Its main component has meter-level amplitude at periods of about 12 hours and longer. The largest body tide constituents are semi-diurnal, but there are also significant diurnal, semi-annual, and fortnightly contributions.Though the gravitational forcing causing earth tides and ocean tides is the same, the responses are quite different.
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