23 terms

Chapter 1 Marine Bio Flashcards Part 2

Marine BIOOOO
STUDY
PLAY
Ridge and rise system
The interconnecting chain of seafloor mountains that trace the edges of crustal plates and the sites of new oceanic crust production
Salinity
A measure of the total amount of dissolved ions in seawater
Seafloor spreading
A global process of oceanic crust moving away from ridge and rise systems where it is formed
Seamounts
An undersea volcano
Shelf break
The outer edge of the continental shelf, typically 100 to 200 m deep
Surface tension
The mutual attraction of water molecules at the surface of a water mass that creates a flexible molecular "skin" over the water surface
Temperature
A relative intensity measure of the condition caused by heat
Thermocline
The ocean layer, usually near the bottom of the photic zone, marked by a sharp change in temperature
Trenches
Deep area in the ocean floor, generally deeper than 6,000 m
Viscosity
The resistance of water molecules to external forces that would separate them
Visible light
That portion of the electromagnetic radiation to which the human eye is sensitive, usually represented as a spectrum of colors from violet to red
anoxia
Without oxygen
Aphotic zone
The portion of the ocean where the absence of sunlight prohibits plant growth
Atmosphere
A unit of pressure equal to 14.7 lbs/in.2 and equivalent to the pressure created by a 10m column of water
Benthic division
pertaining to the sea bottom and the organisms that inhabit the bottom
Buffer
A chemical substance that tends to limit changes in pH levels
Continental boundary current
a surface ocean current flowing generally north or south along a continental edge
Coriolis effect
the apparent change in direction of a moving object (to the left in the Southern Hemisphere and to the right in the Northern Hemisphere) due to the rotation of the Earth
Counter current
an ocean current that flows directly back into another current; also, in some animals, paired blood vessels containing blood flowing in opposite directions
Dirunal tides
a tidal pattern with one high tide and one low tide each lunar day
Fetch
the extent of the ocean over which winds blow to create waves
Fjords
a deep coastal embayment caused by glacial erosion
Gyre
the large loop of interconnected surface ocean currents within a single ocean basin, usually spanning 20 to 30 degrees in latitude