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The main, and most regular, cause of movement in our oceans is due to the gravitational pull of the Moon.

As the Moon orbits the Earth its gravitational field "pulls" the sea upwards and this causes high tides, with low tides following.

Waves are also caused by the action of winds on the surface and, at greater depth, water movement can be due to tectonic movements, or earthquakes, under the sea.

Another cause of ocean currents can be due to the change in density of the water, for example, where freshwater from rivers flows directly into the salty sea..

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