What are tides ?

The periodical rise and fall of the sea level, once or twice a day, mainly due to the attraction of the sun and the moon, is called a tide.
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Which tide occurs on full moon night ?


Spring  Tide

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What are the main processes of cooling of ocean water ?

The processes are:

i. Back radiation of heat from the sea surface,

ii. convection and

iii.evaporation.
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What are ocean currents ?

Regular movements of the surface water of the oceans in the particular directions are called ocean currents.
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Name the two types of waves.

i. Transverse waves 

ii. Longitudinal waves.
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