Mapping of the ocean floor

Question 1ExpertLevel 3

What is the main limitation of single-beam depth sounding in ocean-floor mapping?

AIt gives depth only along the line below the ship trackBIt does not use sound in waterCIt always tells rock age of the sea floorDIt collects samples directly by satellite

Question 2ExpertLevel 3

In multibeam bathymetry, which explanation is most correct when swath width increases?

ADepth measurement completely stopsBA larger sea-floor area can be mapped in less timeCOnly atmospheric clouds are measuredDAge of oceanic crust automatically decreases

Question 3ExpertLevel 3

What is the most likely error if a sound-speed profile is not taken in sea-floor mapping?

AFish number will appear lowBCoastline will become a political boundaryCCalculation of depth and floor position may become wrongDSediments will disappear immediately

Question 4ExpertLevel 3

If ridge segments appear offset and joined by transverse lines on a bathymetric map, what is the most suitable conclusion?

AIt indicates a river deltaBIt indicates a coral lagoonCIt is a passive coastal plainDIt may be linked with transform faults and fracture zones

Question 5ExpertLevel 3

What does nearly equal age on both sides at equal distance from a ridge mean in a sea-floor age map?

ASea-floor spreading has occurred approximately symmetricallyBThe sea floor is static and unchangedCThe shelf is the deepest partDNew crust is forming in trenches

Question 6ExpertLevel 3

Which conclusion becomes strongest by reading magnetic stripes and rock age together?

AOcean salinity is zeroBNew crust forms at ridges and spreads to both sidesCOcean trenches are formed by river erosionDMid-oceanic ridges are only sedimentary plains

Question 7ExpertLevel 3

Why is it necessary to check satellite-altimetry ocean maps with ship-based maps?

ASatellite only counts cloudsBShip-based measurement is always impossibleCSatellite estimation is indirect, so direct depth verification is neededDSatellite brings samples from the sea floor

Question 8ExpertLevel 3

In which situation can the gravity signal of a seamount create a slight bulge on the sea surface?

AWhen the seamount has more mass than surrounding areasBWhen coastal wind completely stopsCWhen a river mouth dries upDWhen tide occurs only on land

Question 9ExpertLevel 3

If depth decreases inward within closed isobaths on an ocean-floor map, what does it indicate?

AOceanic trenchBRaised submarine featureCRiver flood plainDZero sea level

Question 10ExpertLevel 3

If depth increases inward within closed isobaths, which conclusion is suitable?

AThere is a depression or trench-like part on the floorBA summit is raised on the floorCIt is a coastal population centreDIt is an atmospheric pressure zone

Question 11ExpertLevel 3

Why is mapping a submarine fan important in the study of continental rise?

AIt changes sea-surface colourBIt can show depositional pathways of sediments from the slopeCIt turns a mid-ridge into a riverDIt turns volcanoes into clouds

Question 12ExpertLevel 3

Which feature on the ocean floor can turbidity currents help form?

ARing wall of a coral islandBAtmospheric cycloneCSubmarine canyon and depositional fanDCoastal political boundary

Question 13ExpertLevel 3

What does the association of long linear trenches with earthquake epicentres indicate?

AFloods of land riversBCoastal tourism areaCOnly marine fishing zoneDActive convergent plate boundary

Question 14ExpertLevel 3

What do very closely spaced isobaths on the continental slope prove in ocean-floor mapping?

ARapid change in depth over a short horizontal distanceBVery gradual change in depth over a short horizontal distanceCNearly flat ocean floorDBroad shallow continental shelf

Question 15ExpertLevel 3

Why is identification of the shelf break useful on a continental shelf margin?

AIt marks the sharp transition from shelf to continental slopeBIt separates the ocean from the atmosphereCIt turns volcanoes into glaciersDIt makes sea water permanent

Question 16ExpertLevel 3

Which statement is more correct in bathymetric comparison of active and passive continental margins?

APassive margins may commonly have wider shelves and more sedimentsBTrenches never occur at active marginsCSlope is always identical at both marginsDPassive margins are only mid-ocean ridges

Question 17ExpertLevel 3

What historical process can a flat-topped submerged volcanic mountain show?

AOnly river depositionBEarlier wave erosion and later subsidenceCAtmospheric pressure reversalDTerrestrial glacial deposition

Question 18ExpertLevel 3

What can be the most scientific meaning of an age-progressive seamount chain?

APermanent absence of tideBRiver branches in the seaCPassage of a moving plate over a fixed hotspotDComplete flatness of the shelf

Question 19ExpertLevel 3

Which clue is decisive in distinguishing an oceanic plateau from a normal abyssal plain?

AIt occurs only on the coastBIt forms only at river mouthsCIt floats on the sea surfaceDIt is a broad and relatively elevated sea-floor area

Question 20ExpertLevel 3

What can sediment-layer thickness in a seismic reflection profile indicate about sea-floor development?

ASedimentation history and relative age of crustBTaste of sea waterCCoastal market priceDDaily movement of clouds

Question 21ExpertLevel 3

Dominance of basalt in oceanic crust samples supports which interpretation in ocean-floor mapping?

AOceanic crust is mainly made of volcanic basaltic materialBOceanic crust is only sandstoneCThere are no rocks on the sea floorDContinental and oceanic crust are completely identical

Question 22ExpertLevel 3

The occurrence of pillow lava indicates which environment on the ocean floor?

ARiver flood plainBSubmarine basaltic volcanic eruptionCDesert wind depositDGlacial moraine

Question 23ExpertLevel 3

Why is mapping hydrothermal vents important in the study of mid-oceanic ridges?

AThey indicate active heat, fluid flow and mineral depositsBThey show coastal sand colourCThey make water freshDThey show only seabird nests

Question 24ExpertLevel 3

Why is it necessary to read calcareous ooze distribution with depth?

ABecause depth can affect dissolution and preservation of shellsBBecause it only stops tidesCBecause it is equally thick everywhereDBecause it makes the sea floor invisible

Question 25ExpertLevel 3

Where is greater thickness of terrigenous sediments more likely in marine areas?

ANear river mouths and continental marginsBOnly on the axis of mid-ocean ridgesCAlways equally at the bottom of deep trenchesDIn the air above sea surface

Mapping of the ocean floor

Quiz this set

What is the main limitation of single-beam depth sounding in ocean-floor mapping?

In multibeam bathymetry, which explanation is most correct when swath width increases?

What is the most likely error if a sound-speed profile is not taken in sea-floor mapping?

If ridge segments appear offset and joined by transverse lines on a bathymetric map, what is the most suitable conclusion?

What does nearly equal age on both sides at equal distance from a ridge mean in a sea-floor age map?

Which conclusion becomes strongest by reading magnetic stripes and rock age together?

Why is it necessary to check satellite-altimetry ocean maps with ship-based maps?

In which situation can the gravity signal of a seamount create a slight bulge on the sea surface?

If depth decreases inward within closed isobaths on an ocean-floor map, what does it indicate?

If depth increases inward within closed isobaths, which conclusion is suitable?

Why is mapping a submarine fan important in the study of continental rise?

Which feature on the ocean floor can turbidity currents help form?

What does the association of long linear trenches with earthquake epicentres indicate?

What do very closely spaced isobaths on the continental slope prove in ocean-floor mapping?

Why is identification of the shelf break useful on a continental shelf margin?

Which statement is more correct in bathymetric comparison of active and passive continental margins?

What historical process can a flat-topped submerged volcanic mountain show?

What can be the most scientific meaning of an age-progressive seamount chain?

Which clue is decisive in distinguishing an oceanic plateau from a normal abyssal plain?

What can sediment-layer thickness in a seismic reflection profile indicate about sea-floor development?

Dominance of basalt in oceanic crust samples supports which interpretation in ocean-floor mapping?

The occurrence of pillow lava indicates which environment on the ocean floor?

Why is mapping hydrothermal vents important in the study of mid-oceanic ridges?

Why is it necessary to read calcareous ooze distribution with depth?

Where is greater thickness of terrigenous sediments more likely in marine areas?

Quiz result

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Mapping of the ocean floor

Quiz this set

What is the main limitation of single-beam depth sounding in ocean-floor mapping?

In multibeam bathymetry, which explanation is most correct when swath width increases?

What is the most likely error if a sound-speed profile is not taken in sea-floor mapping?

If ridge segments appear offset and joined by transverse lines on a bathymetric map, what is the most suitable conclusion?

What does nearly equal age on both sides at equal distance from a ridge mean in a sea-floor age map?

Which conclusion becomes strongest by reading magnetic stripes and rock age together?

Why is it necessary to check satellite-altimetry ocean maps with ship-based maps?

In which situation can the gravity signal of a seamount create a slight bulge on the sea surface?

If depth decreases inward within closed isobaths on an ocean-floor map, what does it indicate?

If depth increases inward within closed isobaths, which conclusion is suitable?

Why is mapping a submarine fan important in the study of continental rise?

Which feature on the ocean floor can turbidity currents help form?

What does the association of long linear trenches with earthquake epicentres indicate?

What do very closely spaced isobaths on the continental slope prove in ocean-floor mapping?

Why is identification of the shelf break useful on a continental shelf margin?

Which statement is more correct in bathymetric comparison of active and passive continental margins?

What historical process can a flat-topped submerged volcanic mountain show?

What can be the most scientific meaning of an age-progressive seamount chain?

Which clue is decisive in distinguishing an oceanic plateau from a normal abyssal plain?

What can sediment-layer thickness in a seismic reflection profile indicate about sea-floor development?

Dominance of basalt in oceanic crust samples supports which interpretation in ocean-floor mapping?

The occurrence of pillow lava indicates which environment on the ocean floor?

Why is mapping hydrothermal vents important in the study of mid-oceanic ridges?

Why is it necessary to read calcareous ooze distribution with depth?

Where is greater thickness of terrigenous sediments more likely in marine areas?

Quiz result

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