Question

explain the movements that occur in oceans
Explain in 4 points

Answer 1

The major movements of the ocean waters can be classified into three. They are:

Waves

Tides

Ocean Currents

Waves and the ocean currents are horizontal movements of ocean waters while the tide is a kind of vertical movement of the ocean water.



Waves

Waves are nothing but the oscillatory movements that result in the rise and fall of water surface.

Waves are a kind of horizontal movements of the ocean water.

They are actually the energy, not the water as such, which moves across the ocean surface.

This energy for the waves is provided by the wind.

In a wave, the movement of each water particle is in a circular manner.

A wave has two major parts: the raised part is called as the crest while the low-point is called as the trough.



Tides

Tide are the periodical rise and fall of the sea levels, once or twice a day, caused by the combined effects of the gravitational forces exerted by the sun, the moon and the rotation of the earth.

They are a vertical movement of waters and are different from movements of ocean water caused by meteorological effects like the winds and atmospheric pressure changes.

Note: The water movements which are caused by the meteorological effects like the said above are called as surges and they are not regular like tides.

The moon’s gravitational pull to a great extent is the major cause of the occurrence of tides (the moon’s gravitational attraction is more effective on the earth than that of the sun).

Answer 2

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Ocean Currents. The ocean currents are the horizontal flow of a mass of water in a fairly defined direction over great distances. 
Ocean currents can be formed by the winds, density differences in ocean waters due to differences in temperature and salinity, gravity and events such as earthquakes.
An ocean current is any more or less permanent or continuous, directed movementof ocean water that flows in one of the Earth's oceans. 
The currents are generated from the forces acting upon the water like the earth's rotation, the wind, the temperature and salinity differences and the gravitation of the moon
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