The ‘tide-generating’ force is the difference between these two forces i.e.On the side of the earth facing the moon, a tidal bulge occurs while on the opposite side though the gravitational attraction of the moon is less as it is farther away, the centrifugal force causes tidal bulge on the other side.Together, the gravitational pull and the centrifugal force are responsible for creating the two major tidal bulges on the earth.Tidal Bulge – Why there are two tidal bulges? – Why is there a tidal bulge on the other side? Tides occur due to a balance between all these forces.Another factor is centrifugal force which acts opposite to gravitational pull of earth.The moon’s gravitational pull to a great extent and to a lesser extent the sun’s gravitational pull, are the major causes for the occurrence of tides.The study of tides is very complex, spatially and temporally, as it has great variations in frequency, magnitude and height.Movement of water caused by meteorological effects (winds and atmospheric pressure changes) are called surges (storm surge during cyclones).
The periodical rise and fall of the sea level, once or twice a day, mainly due to the attraction of the sun and the moon, is called a tide.
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