Mapping of the ocean floor

Question 1ExpertLevel 5

In ocean-floor mapping, the use of sound waves to measure depth is based on which principle?

AReflection timeBSalinity changeCWind directionDTidal height

Question 2ExpertLevel 5

What is the main purpose of bathymetry in studying deep oceanic regions?

AMeasuring depth and shape of the sea floorBMeasuring colour of seawaterCCounting coastal city populationDShowing rainfall distribution

Question 3ExpertLevel 5

What major improvement did echo sounding make over the traditional rope-and-weight method?

AContinuous and faster depth measurement became possibleBSeawater became freshCContinental drift stoppedDAll trenches disappeared

Question 4ExpertLevel 5

Which is the most suitable indicator for identifying the continental shelf on ocean-floor maps?

AShallow gently sloping part near the coastBDeepest narrow trenchCVolcanic peak in mid-oceanDSteep slope within abyssal plain

Question 5ExpertLevel 5

Why is mapping the continental slope important for understanding oceanic structure?

AIt shows the transition between shelf and deep ocean plainBIt forms only river plainsCIt removes all islandsDIt keeps seawater stationary

Question 6ExpertLevel 5

If a marine profile shows a sudden very deep and narrow part, which feature may it indicate?

AOceanic trenchBContinental shelfCAtollDSea beach

Question 7ExpertLevel 5

Detailed mapping of mid-oceanic ridges strengthens which geological idea?

ASea-floor spreadingBStatic earth theoryCOnly erosion theoryDDesertification

Question 8ExpertLevel 5

Mapping magnetic stripes on the ocean floor provides evidence for what?

ASea-floor spreading and magnetic reversalBOnly coastal erosionCOrigin of riversDMelting of continental glaciers

Question 9ExpertLevel 5

In a contour map of the ocean floor, what are lines joining equal depth called?

AIsobathBIsohyetCIsobarDIsotherm

Question 10ExpertLevel 5

In ocean-floor mapping, satellite altimetry indirectly estimates relief from which information?

ATiny variations in sea-surface heightBNumber of fishCCoastal vegetationDCloud thickness

Question 11ExpertLevel 5

On a map, the main difference between a seamount and a guyot can be identified on what basis?

AShape of the summitBColour of the seaCSound of wavesDTime of tides

Question 12ExpertLevel 5

How is an abyssal plain identified on a bathymetric map?

ABy a very deep broad and nearly flat areaBBy a shallow sandy area near coastCBy a pointed volcanic islandDBy a narrow river valley

Question 13ExpertLevel 5

Mapping submarine canyons on the ocean floor is especially helpful in understanding which process?

ATransfer of sediments to the deep seaBEvaporation of ocean waterCSand deposition in desertsDUplift of the Himalaya

Question 14ExpertLevel 5

Why are surface navigation charts alone insufficient for knowing the real shape of the ocean floor?

AThey show surface routes not complete underwater reliefBThey always show mountain heightsCThey measure only rainfallDThey show only air pressure

Question 15ExpertLevel 5

What can mapping sediment thickness on the ocean floor indicate about plate movement?

ASediment may be thicker on older crust away from ridgesBOldest sediment is always near ridgesCSediment has no relation with plate movementDSediment is zero everywhere

Question 16ExpertLevel 5

What is the advantage of multibeam sonar in ocean-floor mapping?

AIt records depth and shape of a wide swath at onceBIt measures air at one point onlyCIt reduces solar heatDIt makes the sea floor flat

Question 17ExpertLevel 5

How does studying ridges and trenches together in ocean-floor mapping clarify plate boundaries?

ARidges may show creation zones and trenches destruction zonesBBoth are only river depositsCBoth always form on continentsDBoth form by atmospheric pressure

Question 18ExpertLevel 5

Finding crust of similar age at equal distances on both sides of a mid-ocean ridge strengthens which conclusion?

ASymmetrical spreading occurred on both sides of the ridgeBCrust formed only on one sideCThe ridge is entirely made by a riverDThe sea floor is static and immobile

Question 19ExpertLevel 5

Before ocean-floor mapping, why was the ocean floor often assumed to be flat?

ADirect observation under deep water was difficultBThe sea floor was truly equal everywhereCAll ships sankDMapping was legally banned

Question 20ExpertLevel 5

In ocean-floor maps, fracture zones and transform faults indicate what?

ALateral displacement between ridge segmentsBOnly decrease in ocean salinityCMeeting of rainfall linesDSpread of glacier

Question 21ExpertLevel 5

How does high-resolution ocean-floor mapping help in understanding earthquake and volcanic belts?

AIt clarifies active plate boundaries and structuresBIt completely stops earthquakesCIt only increases fishing rateDIt changes monsoon direction

Question 22ExpertLevel 5

What is the main advantage of showing ocean-depth data through colour gradation?

AQuickly understanding depth variation visuallyBChemically changing waterCStopping wave movementDShrinking continents

Question 23ExpertLevel 5

In which situation may a map made by single-beam echo sounding miss small sea-floor features?

AWhen spacing between survey lines is largeBWhen there is water in the oceanCWhen trees are on the coastDWhen it is daytime

Question 24ExpertLevel 5

Why did mapping sea-floor features become decisive for global plate tectonics?

AIt clarified ridges trenches and magnetic evidence togetherBIt proved all mountains are made by riversCIt made oceans disappearDIt stopped Earth rotation

Question 25ExpertLevel 5

The deepest parts of the ocean floor are generally related to which feature?

AOceanic trenchesBContinental shelvesCAbyssal plainsDSea beaches

Mapping of the ocean floor

Quiz this set

In ocean-floor mapping, the use of sound waves to measure depth is based on which principle?

What is the main purpose of bathymetry in studying deep oceanic regions?

What major improvement did echo sounding make over the traditional rope-and-weight method?

Which is the most suitable indicator for identifying the continental shelf on ocean-floor maps?

Why is mapping the continental slope important for understanding oceanic structure?

If a marine profile shows a sudden very deep and narrow part, which feature may it indicate?

Detailed mapping of mid-oceanic ridges strengthens which geological idea?

Mapping magnetic stripes on the ocean floor provides evidence for what?

In a contour map of the ocean floor, what are lines joining equal depth called?

In ocean-floor mapping, satellite altimetry indirectly estimates relief from which information?

On a map, the main difference between a seamount and a guyot can be identified on what basis?

How is an abyssal plain identified on a bathymetric map?

Mapping submarine canyons on the ocean floor is especially helpful in understanding which process?

Why are surface navigation charts alone insufficient for knowing the real shape of the ocean floor?

What can mapping sediment thickness on the ocean floor indicate about plate movement?

What is the advantage of multibeam sonar in ocean-floor mapping?

How does studying ridges and trenches together in ocean-floor mapping clarify plate boundaries?

Finding crust of similar age at equal distances on both sides of a mid-ocean ridge strengthens which conclusion?

Before ocean-floor mapping, why was the ocean floor often assumed to be flat?

In ocean-floor maps, fracture zones and transform faults indicate what?

How does high-resolution ocean-floor mapping help in understanding earthquake and volcanic belts?

What is the main advantage of showing ocean-depth data through colour gradation?

In which situation may a map made by single-beam echo sounding miss small sea-floor features?

Why did mapping sea-floor features become decisive for global plate tectonics?

The deepest parts of the ocean floor are generally related to which feature?

Quiz result

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Mapping of the ocean floor

Quiz this set

In ocean-floor mapping, the use of sound waves to measure depth is based on which principle?

What is the main purpose of bathymetry in studying deep oceanic regions?

What major improvement did echo sounding make over the traditional rope-and-weight method?

Which is the most suitable indicator for identifying the continental shelf on ocean-floor maps?

Why is mapping the continental slope important for understanding oceanic structure?

If a marine profile shows a sudden very deep and narrow part, which feature may it indicate?

Detailed mapping of mid-oceanic ridges strengthens which geological idea?

Mapping magnetic stripes on the ocean floor provides evidence for what?

In a contour map of the ocean floor, what are lines joining equal depth called?

In ocean-floor mapping, satellite altimetry indirectly estimates relief from which information?

On a map, the main difference between a seamount and a guyot can be identified on what basis?

How is an abyssal plain identified on a bathymetric map?

Mapping submarine canyons on the ocean floor is especially helpful in understanding which process?

Why are surface navigation charts alone insufficient for knowing the real shape of the ocean floor?

What can mapping sediment thickness on the ocean floor indicate about plate movement?

What is the advantage of multibeam sonar in ocean-floor mapping?

How does studying ridges and trenches together in ocean-floor mapping clarify plate boundaries?

Finding crust of similar age at equal distances on both sides of a mid-ocean ridge strengthens which conclusion?

Before ocean-floor mapping, why was the ocean floor often assumed to be flat?

In ocean-floor maps, fracture zones and transform faults indicate what?

How does high-resolution ocean-floor mapping help in understanding earthquake and volcanic belts?

What is the main advantage of showing ocean-depth data through colour gradation?

In which situation may a map made by single-beam echo sounding miss small sea-floor features?

Why did mapping sea-floor features become decisive for global plate tectonics?

The deepest parts of the ocean floor are generally related to which feature?

Quiz result

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