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tidal bulge

the "bump" of water on the side of the Earth closest to the moon

diurnal tide

a tidal pattern with one high tide and one low tide each lunar day

semi-diurnal tide

Having two high tides and two low tides each day.


a steady flow (usually from natural causes)

surface ocean current

a continuous horizontal flow of water at or near ocean's surface driven by prevailing winds

deep ocean current

steady flow of surface ocean water in a prevailing direction


the branch of medical science that studies viruses and viral diseases

binary fission

fission into two organisms approximately equal in size


predominantly photosynthetic prokaryotic organisms containing a blue pigment in addition to chlorophyll

chemosynthetic bacteria

bacteria that synthesize organic compounds, using energy derived from the oxidation of organic or inorganic materials without the aid of light.

heterotrophic bacteria

Carbon metabolism in bacteria is either heterotrophic, where organic carbon compounds are used as carbon sources, or autotrophic, meaning that cellular ...

marine snow

small particles of organic biogenic marine sediment, including the remains of organisms, faecal matter, and the shells of planktonic oganisms, that slowly drift down to the sea floor


Any of a group of microorganisms that resemble bacteria but are different from them in certain aspects of their chemical structure, such as the composition of their cell walls.


the taxonomic kingdom of lower plants


reproduction of some unicellular organisms (such as yeasts) by growth and specialization followed by the separation by constriction of a part of the parent


any of several eruptive skin diseases characterized by hard thick lesions grouped together and resembling lichens growing on rocks


microscopic unicellular marine or freshwater colonial alga having cell walls impregnated with silica

amoeboid protozoan

single-celled life-forms characterized by an irregular shape


plant growing in the sea, especially marine algae

compensation depth

It's the depth where light reaches a level where oxygen from a photosynthesizing organism equals that consumed by its respiration.

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