Tide & Wages

Two of the most obvious features of the ocean are waves and tides. Winds drive waves, which travel for long distances as a series of crests and troughs. While the gravitational pull of the moon is responsible for tides.  All coastal areas experience a two low and high tide within a period of 24 hours.  Because the moon is much closer to the Earth than the sun, it has more gravitational attraction.   This effect creates a unique relationship between the two planets.  Therefore when the moon is directly over a given point on the Earth’s surface, it exerts a powerful pull on the water there, which consequently rises above its normal level.
At the same time, the water covering the Earth that is most distant from the moon bulges outwards as a result of the centrifugal force of the revolving Earth. This is the same force that pulls a person away from the centre of a revolving merry go round. This Earth moon relationship revolves around a common centre, which is similar to the centre of a merry go round. A child close to the outer edge of a merry-go-round is pulled outwards more than one near the centre. Likewise, as the Earth revolves around the common centre of the Earth and moon system, the area furthest from the moon is subject to the greatest centrifugal force. As a result, the waters on that side swell outwards.
This means there are always two high-water areas on the Earth at any given time: the area under the moon and the area opposite the moon. Low tides exist in the areas between these high-tide bulges.
Low and high waters moves in a continuous cycle. High tides move with the moon as it revolves around the Earth. At most shores throughout the earth, two high tides and two low tides occur every lunar day, which is the time it takes for the moon to return to a point on the Earth.  About twenty four hours and fifty minutes. Thus, a typical beach will alternate between high and low tides about every six hours. Some coasts, such as the shores along most of Antarctica and other secluded bodies of water, experience only one high tide and one low tide each lunar day. These varying results in the tide cycles occur because of several factors, including different topography and latitude.