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30 Cards in this Set

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abyssal plain, p. 390
Large area of extremely flat ocean floor lying near a continent and generally over 4 km in depth.
the abyssal plain is NOT near a mid-oceanic ridge system
accretionary wedge, p 389
Sediments that accumulate and deform where oceanic and continental plates collide at subduction zones. These sediments are scraped off the top of the downgoing oceanic crustal plate and are appended to the edge of the overriding continental plate.
active continental margin, p 388
a continental margin occuring at convergent plates where oceanic lithosphere is being subducted beneath the margin of a continent. These margins are usually narrow and consist of highly deformed sediments and an accretinary wedge.
bathymetry, p 382
the measurement of ocean depths and the charting of the topography of the ocean floor
black smokers, p 399
Vents on the seafloor sending out hydrothermal fluids. Upon mixing with seawater and cooling, the fluids precipitate a cloud of fine-grained sulfide minerals resembling a cloud of black smoke.
buoyant subduction, p 405
omit
omit
continental margin, p 335
x
continental rift, p 399
x
continental rise, p 386
The portion of the continental margin that lies between the abyssal plain and the continental slope. The continental rise is underlain by crustal rocks of the ocean basin.
the continental rise dips more steeply than the continental slope.
continental shelf, p 335
x
continental slope, p 336
That part of the continental margin that lies between the continental shelf and the continental rise.
deep-ocean basin, p 389
x
deep-ocean trench, p 389
x
deep-sea fan, p 388
x
echo sounder, p 383
x
guyot, p 391
A flat-topped, volcanic mountain on the seafloor not connected to a mid-ocean ridge.
mid-ocean ridge, p 391
x
oceanic plateau, p. 391
x
oceanic ridge, p 391
x
ophiolite complex, p 397
A suite of mafic and ultramafic rocks and associated marine cherts and their metamorphic equivalents.
passive continental margin, p 335
x
pillow basalts, p 398
A structure observed in certain igneous rocks extruded into water, characterized by discontinuous, close-fitting, pillow-shaped masses, commonly 30 to 60 cm across
rift valley, p 392
x
rift zone, p 394
x
seamount, p 390
see "guyot"
seismic reflection profile, p 383
x
sheeted dike complex, p 398
x
sonar, p 383
x
supercontinent cycle, p 407
x
tablemount, p 391
x