Mapping of the ocean floor

Question 1ExpertLevel 1

If a seafloor map shows rock age increasing on both sides away from a mid oceanic ridge what is the most accurate interpretation?

ANew crust forms at the ridge and spreads on both sidesBNew crust forms in trenches and moves toward ridgesCContinental shelf alone forms oceanic crustDSeawater decreases the age of rocks

Question 2ExpertLevel 1

If the two way travel time of a sound signal doubles while sound speed in water remains constant what happens mathematically to depth?

ADepth becomes halfBDepth doublesCDepth becomes zeroDDepth remains unchanged

Question 3ExpertLevel 1

Which map evidence can show that an oceanic trench is not merely deep but also a plate boundary?

AA dipping belt of earthquakes along the trenchBConstant temperature lines above the trenchCA wide sandy coast far from the trenchDA fishing ground near the trench

Question 4ExpertLevel 1

On a bathymetric map if isobaths are widely spaced on a ridge top but closely spaced on its flank what does it mean?

ARidge crest is relatively gentle and flank is steepBThe whole region has equal depthCThe ridge must be a continental shelfDIsobaths do not indicate slope

Question 5ExpertLevel 1

If fracture zones are seen cutting a ridge into segments on a detailed seafloor map what is their main significance?

AThey show plate motion and transform fault orientationBThey are only remnants of river meandersCThey are salinity lines of seawaterDThey are boundaries of fish species

Question 6ExpertLevel 1

If sediment thickness is low near a ridge and greater farther away what conclusion is most appropriate?

ASeafloor away from ridge is older so it had more time for sediment accumulationBSediment always makes mountains on ridgesCThe distant floor must be continentalDSediment thickness has no relation with time

Question 7ExpertLevel 1

Satellite altimetry does not directly see the seafloor yet how does it indicate ridges and seamounts?

ATiny sea surface bulges relate to gravity mass variationsBIt sends a camera inside the oceanCIt measures chemical age of every rockDIt makes the ocean transparent

Question 8ExpertLevel 1

In which situation would multibeam sonar seafloor shape be more reliable than single point depth sounding?

AWhen making a detailed model of a complex trench and seamount areaBWhen only one well depth is neededCWhen measuring sea surface colourDWhen counting coastal population

Question 9ExpertLevel 1

What scientific idea is supported by identical sequence of magnetic stripes on both sides of a ridge?

AMagnetic reversals were recorded in new crust and the floor spread both waysBSeawater always flows in one directionCContinental shelf forms the oldest crustDTrenches cannot have magnetism

Question 10ExpertLevel 1

Why can identifying the shelf break at the edge of the continental shelf be difficult?

ABecause slope change may be gradual and covered by sedimentsBBecause shelf is not found in oceansCBecause isobaths are always absentDBecause sound cannot travel in water

Question 11ExpertLevel 1

Which map pattern is more likely to identify a passive continental margin?

AWide shelf thick sediments and absence of deep trenchBNarrow shelf deep trench and intense earthquake beltCRift at ridge center and high heat flowDTrench parallel to island arc

Question 12ExpertLevel 1

If a submerged mountain has a flat top and deep floor around it what does it indicate about its earlier stage?

AIt may once have been flattened by erosion near sea levelBIt was always a river deltaCIt is currently part of the HimalayaDIt was never submerged in the ocean

Question 13ExpertLevel 1

Why are deep sea fans generally located at the base of the continental slope?

ABecause submarine currents carry sediment down the slope and spread itBBecause sunlight reaches there the mostCBecause tides stop there permanentlyDBecause only corals grow there

Question 14ExpertLevel 1

Why are temperature salinity and pressure included in ocean depth measurement?

AThey change sound speed in waterBThey change ridges into trenchesCThey erase seafloor age instantlyDThey stop satellites

Question 15ExpertLevel 1

Which oceanic feature suggests that two plates are moving apart?

AMid oceanic ridge with a central rift valleyBDeep trench in front of an island arcCMarine beach on continental shelfDDelta at river mouth

Question 16ExpertLevel 1

If heat flow decreases away from a ridge on an ocean floor map what is the scientific meaning?

ANew hot crust forms at the ridge and cools away from itBSolar heat accumulates in trenchesCNo temperature change occurs on shelvesDAbyssal plain is always volcanic

Question 17ExpertLevel 1

Why may abyssal plains have an irregular rocky basement even though they appear extremely flat?

ABecause fine sediments cover older reliefBBecause there are no rocks thereCBecause seawater never erodes the floorDBecause all depths are artificial

Question 18ExpertLevel 1

On a seafloor map if volcanic islands lie landward and a trench lies oceanward of an island arc what plate process is indicated?

ASubduction of an oceanic plateBExpansion of continental shelfCGlaciation of abyssal plainDEvaporation of seawater

Question 19ExpertLevel 1

Which statement shows that bathymetry is not merely a collection of depths?

AIt explains relief and tectonic processes from depth patternsBIt only tells sweetness of seawaterCIt is only the art of colouring mapsDIt only gives coastline length

Question 20ExpertLevel 1

If a marine area is surveyed only along ship tracks and gaps remain between them what error may occur in the map?

ASmall seamounts or trenches may be missedBSea surface will disappearCAll measurements will be completely trueDContinent will turn into ocean

Question 21ExpertLevel 1

What can be one reason for relatively low sediment accumulation in oceanic trenches?

ASubduction and steep slopes may drag or destabilize sedimentsBTrenches are outside the oceanCTrenches have no gravityDTrenches have no water

Question 22ExpertLevel 1

The global distribution of mid oceanic ridges reflects which deep Earth process?

AUpwelling of material from mantle and formation of new crustBOnly breaking of surface wavesCRivers bringing sandDReduction of atmospheric pressure

Question 23ExpertLevel 1

Why can seafloor mapping help in the study of ocean circulation?

ABottom relief can control or deflect deep water pathwaysBBottom relief stops windCMapping removes salinityDRidges create rainfall

Question 24ExpertLevel 1

If a deep V shaped submerged canyon appears on the continental slope what may it indicate?

AA submarine route carrying sediment to deep seaBPermanent glacial plainCTidal island on sea surfaceDAtmospheric pressure belt

Question 25ExpertLevel 1

The presence of a linear trench parallel to an island arc on an ocean floor map is advanced evidence of what?

AConvergent plate boundary and subductionBDivergent plate boundary and new crustCPassive margin and thick shelfDFlat abyssal plain and sediment

Mapping of the ocean floor

Quiz this set

If a seafloor map shows rock age increasing on both sides away from a mid oceanic ridge what is the most accurate interpretation?

If the two way travel time of a sound signal doubles while sound speed in water remains constant what happens mathematically to depth?

Which map evidence can show that an oceanic trench is not merely deep but also a plate boundary?

On a bathymetric map if isobaths are widely spaced on a ridge top but closely spaced on its flank what does it mean?

If fracture zones are seen cutting a ridge into segments on a detailed seafloor map what is their main significance?

If sediment thickness is low near a ridge and greater farther away what conclusion is most appropriate?

Satellite altimetry does not directly see the seafloor yet how does it indicate ridges and seamounts?

In which situation would multibeam sonar seafloor shape be more reliable than single point depth sounding?

What scientific idea is supported by identical sequence of magnetic stripes on both sides of a ridge?

Why can identifying the shelf break at the edge of the continental shelf be difficult?

Which map pattern is more likely to identify a passive continental margin?

If a submerged mountain has a flat top and deep floor around it what does it indicate about its earlier stage?

Why are deep sea fans generally located at the base of the continental slope?

Why are temperature salinity and pressure included in ocean depth measurement?

Which oceanic feature suggests that two plates are moving apart?

If heat flow decreases away from a ridge on an ocean floor map what is the scientific meaning?

Why may abyssal plains have an irregular rocky basement even though they appear extremely flat?

On a seafloor map if volcanic islands lie landward and a trench lies oceanward of an island arc what plate process is indicated?

Which statement shows that bathymetry is not merely a collection of depths?

If a marine area is surveyed only along ship tracks and gaps remain between them what error may occur in the map?

What can be one reason for relatively low sediment accumulation in oceanic trenches?

The global distribution of mid oceanic ridges reflects which deep Earth process?

Why can seafloor mapping help in the study of ocean circulation?

If a deep V shaped submerged canyon appears on the continental slope what may it indicate?

The presence of a linear trench parallel to an island arc on an ocean floor map is advanced evidence of what?

Quiz result

Add Muft Shiksha to your Home Screen

Mapping of the ocean floor

Quiz this set

If a seafloor map shows rock age increasing on both sides away from a mid oceanic ridge what is the most accurate interpretation?

If the two way travel time of a sound signal doubles while sound speed in water remains constant what happens mathematically to depth?

Which map evidence can show that an oceanic trench is not merely deep but also a plate boundary?

On a bathymetric map if isobaths are widely spaced on a ridge top but closely spaced on its flank what does it mean?

If fracture zones are seen cutting a ridge into segments on a detailed seafloor map what is their main significance?

If sediment thickness is low near a ridge and greater farther away what conclusion is most appropriate?

Satellite altimetry does not directly see the seafloor yet how does it indicate ridges and seamounts?

In which situation would multibeam sonar seafloor shape be more reliable than single point depth sounding?

What scientific idea is supported by identical sequence of magnetic stripes on both sides of a ridge?

Why can identifying the shelf break at the edge of the continental shelf be difficult?

Which map pattern is more likely to identify a passive continental margin?

If a submerged mountain has a flat top and deep floor around it what does it indicate about its earlier stage?

Why are deep sea fans generally located at the base of the continental slope?

Why are temperature salinity and pressure included in ocean depth measurement?

Which oceanic feature suggests that two plates are moving apart?

If heat flow decreases away from a ridge on an ocean floor map what is the scientific meaning?

Why may abyssal plains have an irregular rocky basement even though they appear extremely flat?

On a seafloor map if volcanic islands lie landward and a trench lies oceanward of an island arc what plate process is indicated?

Which statement shows that bathymetry is not merely a collection of depths?

If a marine area is surveyed only along ship tracks and gaps remain between them what error may occur in the map?

What can be one reason for relatively low sediment accumulation in oceanic trenches?

The global distribution of mid oceanic ridges reflects which deep Earth process?

Why can seafloor mapping help in the study of ocean circulation?

If a deep V shaped submerged canyon appears on the continental slope what may it indicate?

The presence of a linear trench parallel to an island arc on an ocean floor map is advanced evidence of what?

Quiz result

Analytics choices