How do tides occur?

938 Views Updated: 27 Jan 2017
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How do tides occur?

Tides are an oceanic occurrences in which the water contained in the oceans and seas, periodically rises and falls near the shore owing to interaction of the gravitation forces of the Earth, the Moon and the Sun along with the balancing centrifugal force of the earth. There are three phenomena responsible behind the occurrence of tides, which are:

Gravitational pull of the Moon: Earth’s gravity makes all the organisms and inanimate stick to earth’s surface, except water. The water has a tendency to flow, which makes it vulnerable towards the gravitational pull of the moon resulting in the bulging of water from the surface of earth. The bulging of water resulting due to the gravitational effect of the moon are called high tides that occur twice a day when the moon is closest to the earth.

Gravitational pull of the Sun: Earth revolves around the Sun, which also exerts a gravitational pull on the earth’s surface, which results in tides but the intensity of the pull is quite less, owing to the distance and size of the sun in comparison to the moon.

Centrifugal force of the Earth: The centrifugal force is the answer behind the occurrence of tides at the side of the earth that does not face the moon or the sun. The centrifugal force works exactly opposite to gravity, it pushes the objects on the earth away, but the gravitational pull balances it.

But when moon or the sun is closer to the earth, the gravitational fields of the two interact and the resultant pull becomes less than the innate centrifugal force of the earth which causes the water to bulge at the side of earth that does not face the moon.

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