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30 terms

OCE CH 3

STUDY
PLAY
GLORIA
device used for side-scan sonar
Hypsometric curve
cumulative plot of area versus depth or
PDR
Uses high frequency sound waves to measure ocean depth
Seismic survey
used to determine shape and position of boundaries
Abyssal plains are more extensive on the floor of the Atlantic as compared those on the
floor of the Pacific
True
Sediments of the continental rise can exhibit characteristics similar to those formed by
rivers on land.
True
A sediment-laden current that flows off of the continental shelf is called a turbidity
current
True
The deepest portions of the ocean are part of the relatively narrow features called
submarine canyons
False
Seamounts form from ancient tablemounts
False
Mid-ocean ridges are rises occupy a small portion of the deep ocean basin, only around
10%.
False
Hydrothermal vents have a significant impact on ocean chemistry
True
Due to the very harsh environment, few organisms are found in association with
hydrothermal vents
False
The two relatively flat areas on the hypsometric curve represent
some interior continental areas/ coastal plains and abyssal plains
The method that is most frequently used to investigate sediment and rock layers of the sea floor is:
Sound waves
Satellites are used to map the ocean floor because they
a. are unaffected by surface weather.
b. can cover areas where ships have not produced surveys.
c. can "see" large areas of the seafloor at one time.
d. the shape of the ocean surface itself reflects large features on the seafloor below
Passive continental margins are characterized by all of the following
a. broad continental shelf.
c. shallow coastal waters.
d. thick sediment accumulation.
e. very little volcanic and earthquake activity.
Characteristics of active continental margins include all of the following
b. chains of islands.
c. deep-sea trenches.
d. thin sediment accumulation.
e. volcanic and earthquake activity.
The correct order of marine provinces from the coast to the mid-ocean ridge is
shelf, slope, rise, abyssal plain.
Directly seaward of the continental shelf is a more steeply sloping region called the:
Continental Slope
All of the following are considered part of the continental margin
a. continental rise.
b. continental shelf.
c. continental slope.
e. submarine canyon.
Continental rises are formed:
by many deep sea fans
Submarine canyons were most likely formed by
erosion by turbidity currents
The most rapid change in slope in the ocean is found at the
oceanic trench
The most gradual change in slope in the ocean can be found at the
abyssal plain.
Old lithosphere is destroyed in association with
deep-sea trenches
Abyssal hills are only visible in the Pacific Ocean because
they are higher in the Pacific than in the other ocean basins
New lithosphere is produced in association with
mid-ocean ridges
Hydrothermal vents between 30 degrees C and 350 degrees C produce
white smokers
With respect to mid-ocean ridges, transform faults are
perpendicular to the ridge axis
coccolithophores
biogenous sediment