part_of part of part of ocean sea marine layer surface layer of a water body sea surface layer 2019-03-06T01:22:01Z A surface layer which is part of an ocean or sea. envoMarine At this level, the depth of this layer is ambiguous. Some methods (telemetry) measure only the first few centimeters of the sea or ocean surface. In situ methods often sample the first few meters. Subclasses can be created for such cases. Sea surface layer is also used to refer to the surfaces of oceans. envoPlastics