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34 Cards in this Set

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  • Back
in the interior of the earth, what is under the Gutenberg discontinuity?
outer core
in order to determine the location of epicenter of an earthquake, seismic data from at least_____ stations are required?
three
which one of the following is not a typical gravity correction?
longitude change
which one of the following is not a direct evidence in support of continental drift?
similar oxygen isotope sea-level curve
which one is a feature of S waves
shear waves
from the surface to the center of earth, the earth layers ______
pressure increases
temp increases
density increases
along the ocean-ocean convergent boundary, which type of earthquakes is farthest away from the trench?
deep
which one of the following descriptions of transform fault is incorrect?
motion of plates is parallel to ridges
which one is not a major plate?
atlantic
which one of the following is a feature for an active margin?
frequent earthquakes
along a typical active margin, which one of the following is a part of the back-arc system?
marginal basin
along a passive margin, which one of the following is not a major sediment damming?
submarine canyon
according to the wilson cycle, which feature forms within a mature ocean basin?
mid-cean ridge
if past trends continue into the future, all but which of the following can be expected to occur in the next 10 million years?
pacific ocean will grow larger
thick continental margin sediments, greater than the average ocean depth, result from:
all of the above. subsidence due to sediment weight, salt diapirs damming sediments and subsidence due to cooling crust
plates are:
rigid units of lithosphere that moves as a unit
thrust faults are:
older strata thrusts on top of younger strata
moho discontinuity is:
a great speed increase in P and S waves
isostacy
the earth is in gravitational equilibrium through buoancy mechanisms.
what is the average global sea-level riding rate during the past century?
1-2 mm/yr
which one of the following is related to the longest sea level periodicity?
ridge length
which causes the greatest vertical sea-level change?
mid-ocean ridge change
which is not true of deltaic environments?
the delta front has a fining upward sequence of sediments
where can we find muddier sediment in an estuary?
main estuary
as opposed to a mixed energy barrier island, features of wave-dominated barrier islands include all but:
large ebb tidal deltas
if a barrier island is long, narrow, and low, what kind of process dominates?
wave
what process is not involved with landward migration of a barrier island?
addition of ebb tidal deposits.
where do siliceous oozes usually occur?
beneath upwelling zones
which indicates periods of warmer climate conditions?
increased kaolinite clay
the preservation of biogenic sediment is dependent on the following factors except:
supply of authigenic mineral
carbonate oozes might indicate original deposition in which environment?
on a plateau
which is not a producer of siliceous ooze?
cocclithophore
which type of subaqueous sediemnt transport contains the highest percentage of water?
turbidity current
what one of the following ooze is most abundant 60 S around antarctic ocean?
diatom