What is tides

1.	What is tides
Answer» \tThe 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.\tMovement of water caused by meteorological effects (winds and atmospheric pressure changes) are called surges.\tSurges are not regular like tides.\tThe ‘tide-generating’ force is the difference between these two forces; i.e. the gravitational attraction of the moon and the centrifugal force.\tOn the surface of the earth, the horizontal tide generating forces are more important than the vertical forces in generating the tidal bulges.\tThe tidal bulges on wide continental shelves, have greater height. When tidal bulges hit the mid- oceanic islands they become low.\tThe shape of bays and estuaries along a coastline can also magnify the intensity of tides. Funnel-shaped bays greatly change tidal magnitudes. When the tide is channeled between islands or into bays and estuaries they are called tidal currents.

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