Tides are the periodic rise and fall of all ocean waters, caused by the gravitational pull of the Moon. The Moon's pull on the Earth draws the ocean water towards the Moon, making the water form a huge swell. This is known as a high tide. Water closest to the Moon will always be the point of the highest tide. As the Earth spins around, different oceans become the closest stretch of water to the Moon. This is why all oceans and seas have different points of high tide at different times of the day or night. Newton’s law of universal gravitation states that the gravitational attraction between two bodies is directly proportional to their masses, and inversely proportional to the square of the distance between the bodies (Sumich, J.L., 1996; Thurman, H.V., 1994). Therefore, the greater the mass of the objects and the closer they are to each other, the greater the gravitational attraction between them (Ross, D.A. 1995).
Fact file
Spring tides are tides with unusually high ranges twice per month when the Sun, Earth, and Moon are in line. They can be especially high in the spring and autumn.
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