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18 terms

Chapters 14 & 15 - Ocean Floor, Ocean Water and Ocean Life

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Abyssal Plains
Deep and extremely flat features found on ocean floor they are the most level places on Earth.
Bathymetry
The measurement of ocean depths and the charting of the shape or topography of the ocean floor.
Benthos
Describes organisms living on or in the ocean bottom.
Continental Margin
The zone of transition between a continent and the adjacent ocean basin floor.
Continental Rise
In regions where trenches do not exist the steep continental slope merges into a more gradual incline this exists.
Continental Shelf
The gentle sloping submerged surface extending from the shoreline.
Continental Slope
This marks the seaward edge of the continental shelf.
Mid-Ocean Ridge
Found near the center of most ocean basins and interconnected system of underwater mountains that have developed on newly formed ocean crust.
Mixed Zone
The area of the surface created by the mixing of water by waves and current and tides.
Nekton
Includes all animals capable of moving independently of the ocean currents by swimming or other means of propulsion.
Ocean Basin Floor
This lies between the continental margin and mid-ocean ridge.
Plankton
Includes all organisms - algae, animals, and bacteria - that drift with the ocean currents.
Pycnocline
The layer of ocean water between about 300 meters and 1000 meters where there is a rapid change of density with depth.
Salinity
The total amount of solid material dissolved in water.
Seamounts
The submerged volcanic peaks that dot the ocean floor.
Sonar
An acronym for sound navigation and ranging, also referred to as echo sounding.
Thermocline
The layer of ocean water between about 300 meters and 1000 meters, where there is a rapid change of temperature with depth.
Turbidity Current
Occasional movements of dense, sediment-rich water down the continental slope.

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