Seed-bearing organisms of the phylum Anthophyta are the only marine plants from Kingdom Plantae.

A plastic nurdle is a 1 meter by 1 meter by 1 meter container holding waste to be dumped in the ocean. 

Ocean water preferentially absorbs blue colors causing the ocean water to appear blue.

A toxic compound is a poisonous substance that has the capability to cause injury or death by chemical means.

The mass of fish caught today exceeds the mass of fish caught at any other time in human history.

A major source of mercury in the ocean is the effluent from coal fired power plants.

Benthic organisms live above the ocean floor.

Natural petroleum seeps on the ocean floors contribute almost half of all oil seeping into the oceans.

MARPOL is an international agreement between countries to limit chemical pollutant disposal in the ocean.

Light transmission into the ocean can reach depths of one km, but at that depth, it is inadequate to drive photosynthesis.