Sea
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A sea is a large body of salty water. There are particular seas and the sea. The sea commonly refers to the ocean, the wider body of seawater.
Particular seas are either marginal seas, second-order sections of the oceanic sea, or certain large, nearly landlocked bodies of water.
Atlantic Ocean near the Faroe Islands.
Composite images of the Earth created by NASA in 2001
The 2004 tsunami in Thailand
Praia da Marinha in Algarve, Portugal
Marine habitat
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A marine habitat is a habitat that supports marine life. Marine life depends in some way on the saltwater that is in the sea. A habitat is an ecological or environmental area inhabited by one or more living species. The marine environment supports many kinds of these habitats.
Land runoff, pouring into the sea, can contain nutrients
This algae bloom occupies sunlit epipelagic waters off the southern coast of England. The algae are maybe feeding on nutrients from land runoff or upwellings at the edge of the continental shelf.