Salinity
Temperature & Density
Zones
Organisms
Feeding/Energy
100
What is the chemical name for the most abundant salt in the sea?
Sodium chloride
100
What is density?
Mass per unit volume
100
Which ocean zone is characterized by high water pressure, low temperatures, and no sunlight?
The abyssal zone
100
What are floating marine organisms called?
Plankton
100
What percent of energy is usually transferred between trophic levels?
10%
200
What is the unit for ocean salinity?
Parts per thousand
200
What two factors affect the density of seawater?
Temperature and salinity
200
What is the area where land and ocean meet and overlap called?
The intertidal zone
200
What are marine animals that swim freely called?
Nekton
200
What two factors influence a region's photosynthetic productivity?
Nutrients and sunlight
300
What are the two major sources of elements in seawater?
Weathering of rocks and Earth's interior
300
The ocean's surface water temperature varies with the amount of solar radiation received. What factor primarily affects this?
Latitude
300
What is the open ocean of any depth called?
The pelagic zone
300
What are organisms that live on or in the ocean bottom called?
Benthos
300
What is the process by which certain microorganisms use chemical energy to produce food?
Chemosynthesis
400
What two processes increase the salinity of seawater?
Evaporation and the formation of sea ice
400
What is the layer of the ocean where temperature changes rapidly with depth?
The thermocline
400
Most ocean water is located in which zone?
The deep zone
400
According to what two factors are marine organisms classified?
Where they live and how they move
400
At which step would a primary producer be located in a food chain?
At the first one
500
What four processes decrease the salinity of seawater?
precipitation, runoff from land, icebergs melting, and sea ice melting
500
What is the layer of the ocean where the density changes rapidly with depth?
The pycnocline
500
Where would you find the lowest density seawater?
The surface mixed zone
500
What are organisms that are eaten called?
Prey
500
What limits productivity in tropical regions?
The lack of nutrients
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