| A | B |
|---|
| salinity | a measure of the amount of dissolved salts in a given amount of liquid |
| pack ice | a floating layer of sea ice that completely covers an area of the ocean surface |
| thermocline | a layer in a body of water in which water temperature drops with increased depth faster than it does in other layers |
| density | ratio of mass of a substance to volume of the substance; expressed as grams per cm3 or grams per liter |
| upwelling | the movement of deep, cold & nutrient-rich water to the surface |
| plankton | mass of mostly microscopic organisms that float or drift freely in waters of aquatic environments |
| nekton | all organisms that swim actively in open water, independent of currents |
| benthos | organisms that live at the bottom of oceans or bodies of fresh water |
| benthic zone | the bottom region of oceans & bodies of fresh water |
| pelagic zone | the region of an ocean or body of fresh water above the benthic zone |
| desalination | a process of removing salt from ocean water |
| aquaculture | the raising of aquatic plants & animals for human use or consumption |
