Chapter 20

a measure of the amount of dissolved salts are given amount of liquid

• salinity

• nekton

• density

the movement of cold, deep and nitrogent rich water of the surface

• pelagic

• benthos

• upwelling

organisims that live at the bottom of oceans

• Benthos

• nekton

• benthos zone

the mass of mostly microscoping organisims that float to drift freely in waters of aquatic environments

• plankton

• bacteria

the bottom region of the ocean

• Benthic zone

• salinity

• desalination

• pelagic zone

a floating layer of sea ice that completely covers an area of the ocean surface

• pack ice

• pelagic zone

• benthic zone

the regions of an ocean above the bethic zone

• pelagic zone

• benthic zone

• nekton

a layer if body of water in which tempeture drops with increased depth faster that it does in all other layers

• thermocline

• tempeture

• desalination

all organisims that swim actively in open water independently in open currents

• nekton

• benthos

• plankton

the ratio of the mass of a substance to the volume of the substance

• density

• thermocine

• upwelling