What is the difference between sea and ocean?

We distinguish the following differences:
A sea is part of a specific ocean. The ocean is an essential, large part of the World Ocean, which occupies 2/3 of the planet’s surface.
Respectively the sizes of reservoirs differ.
System of currents. The ocean has surface cold and warm water masses. The sea has only one course. It can be surface warm or cold current.
The bottom of the ocean is the Earth’s oceanic crust, and by the sea there is a continental plume. The exceptions are the Sargasso and Philippine Seas.

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