Mapping of the ocean floor

Question 1ExpertLevel 2

Which option gives the strongest set of evidence for seafloor spreading?

ARidge magnetic stripes on both sides age pattern and heat flowBCoastline weather and rainfallCRiver valley plain and desertDSea colour clouds and wind

Question 2ExpertLevel 2

What was the scientific weakness of old rope based sounding compared with modern sonar?

AIt was discontinuous slow and less accurate in deep complex areasBIt instantly changed the seafloorCIt was faster than satellitesDIt measured magnetic stripes

Question 3ExpertLevel 2

Why is oceanic crust generally not found as old as very ancient continental crust?

AOceanic crust is continuously formed and destroyed by subductionBOceanic crust has no rocksCContinental crust forms in the seaDSeawater stops age dating

Question 4ExpertLevel 2

If numerous small highs are spread over an abyssal plain on a bathymetric map what conclusion is appropriate?

AThey may be abyssal hills and the floor is not completely smoothBThey are only surface wavesCThey are continental glaciersDThey are coastal sand dunes

Question 5ExpertLevel 2

If ages of a seamount chain increase progressively in one direction what process may it indicate?

APlate movement over a hotspotBSeawater becoming staticCSudden disappearance of shelfDTrench becoming flat

Question 6ExpertLevel 2

Which problem of Wegener's continental drift theory began to be addressed by ocean floor mapping?

AExplanation of the mechanism of continental movementBExistence of fossilsCExistence of coastlinesDCause of rainy season

Question 7ExpertLevel 2

In which situation would isobaths most clearly identify the continental slope?

AClosely spaced depth lines appear suddenly after the shelfBAll lines disappear near the coastCLines are circular in abyssal plainDLines change colour on a ridge

Question 8ExpertLevel 2

Which option gives the correct interpretation of the deep ocean floor?

AIt is a complex region with ridges trenches seamounts abyssal plains and sedimentary areasBIt is only a uniform flat plainCIt is only an extension of continental shelfDIt is an unmappable empty space

Question 9ExpertLevel 2

If bathymetric data has good vertical accuracy but wrong horizontal position what will be the main problem?

AFeatures will show correct depth but at wrong locationsBDepth will always become zeroCSeafloor will disappearDThe map subject will become history

Question 10ExpertLevel 2

If a high resolution seafloor image shows broken sediments slumps and debris deposits on a slope what geohazard can be identified?

ASubmarine landslideBContinental avalancheCCoastal desertificationDMarine rainbow

Question 11ExpertLevel 2

Thin sediment cover and high heat flow near a ridge together indicate which condition?

ARecently formed new oceanic crustBVery old passive continental marginCStable delta plainDOld continental slope

Question 12ExpertLevel 2

Which map evidence shows that the ocean floor is renewed over time?

AYoung crust at ridges and destruction of old crust at trenchesBCrust of identical age everywhereCAbsence of depth linesDStraight coastline

Question 13ExpertLevel 2

For which two reasons is detailed mapping of shallow continental shelf especially important?

AResource exploration and safe navigationBHimalayan formation and stopping monsoonCEclipse calculation and star mappingDDesert expansion and deforestation

Question 14ExpertLevel 2

In which situation might a bathymetric map lead to confusion between a trench and an abyssal plain?

AWhen map scale is too small and depth differences are generalizedBWhen map has a north arrowCWhen colours are clearDWhen depth unit is written

Question 15ExpertLevel 2

When a belt of volcanic islands occurs near a deep sea trench what is the most scientific cause?

AMelting related to the subducted plate and rise of magmaBEvaporation at the sea surfaceCDeposition of sand on shelfDQuiet sediment on abyssal plain

Question 16ExpertLevel 2

If isobaths in an ocean basin form nearly circular closed lines with a shallower centre what feature is likely present?

ASeamountBDeep trenchCFlat shelfDSubmarine canyon

Question 17ExpertLevel 2

On a seafloor map if a long narrow deep feature has intense earthquakes nearby which conclusion should be avoided?

ACalling it merely a quiet sedimentary plainBConsidering it a possible subduction zoneCLinking it with an active plate boundaryDExamining it as an oceanic trench

Question 18ExpertLevel 2

Why can colour classification in an ocean floor map influence interpretation?

AWrong colour intervals can understate or exaggerate slopes and depth differencesBColour changes the seafloorCColour removes magnetismDColour stops plate motion

Question 19ExpertLevel 2

Why is technology like global positioning system necessary in ocean floor mapping?

ATo link depth measurements with correct geographic locationBTo measure taste of seawaterCTo cool magmaDTo count marine organisms

Question 20ExpertLevel 2

For identifying which oceanic landform are a summit below sea level and an independent elevation important?

ASeamountBContinental riseCOcean trenchDIsobath

Question 21ExpertLevel 2

If a map shows a wedge like spread of sediments after the continental slope what zone may it be?

AContinental riseBMid oceanic ridgeCDeep oceanic trenchDVolcanic island arc

Question 22ExpertLevel 2

What is the greatest risk in laying submarine cables without understanding seafloor relief?

ACables may be damaged by slopes landslides trenches or highsBCable will dry the oceanCCable will change latitudeDCable will move into the atmosphere

Question 23ExpertLevel 2

In which situation would direct seafloor sampling improve interpretation of mapping data?

AWhen confirming the rock type and age of a seafloor highBWhen making only a weather forecastCWhen counting surface wavesDWhen knowing coastal population

Question 24ExpertLevel 2

Why is seafloor mapping useful for reducing natural hazard risk?

AIt helps understand landslide zones trenches seismic zones and tsunami sourcesBIt completely stops earthquakesCIt makes the ocean a stable solidDIt ends rainfall

Question 25ExpertLevel 2

At expert level what is the most appropriate way to read an ocean floor map?

AIntegrating depth form age sediment magnetism and plate contextBConcluding only from colourCUnderstanding the floor only from coastlineDKeeping the map separate from geology

Mapping of the ocean floor

Quiz this set

Which option gives the strongest set of evidence for seafloor spreading?

What was the scientific weakness of old rope based sounding compared with modern sonar?

Why is oceanic crust generally not found as old as very ancient continental crust?

If numerous small highs are spread over an abyssal plain on a bathymetric map what conclusion is appropriate?

If ages of a seamount chain increase progressively in one direction what process may it indicate?

Which problem of Wegener's continental drift theory began to be addressed by ocean floor mapping?

In which situation would isobaths most clearly identify the continental slope?

Which option gives the correct interpretation of the deep ocean floor?

If bathymetric data has good vertical accuracy but wrong horizontal position what will be the main problem?

If a high resolution seafloor image shows broken sediments slumps and debris deposits on a slope what geohazard can be identified?

Thin sediment cover and high heat flow near a ridge together indicate which condition?

Which map evidence shows that the ocean floor is renewed over time?

For which two reasons is detailed mapping of shallow continental shelf especially important?

In which situation might a bathymetric map lead to confusion between a trench and an abyssal plain?

When a belt of volcanic islands occurs near a deep sea trench what is the most scientific cause?

If isobaths in an ocean basin form nearly circular closed lines with a shallower centre what feature is likely present?

On a seafloor map if a long narrow deep feature has intense earthquakes nearby which conclusion should be avoided?

Why can colour classification in an ocean floor map influence interpretation?

Why is technology like global positioning system necessary in ocean floor mapping?

For identifying which oceanic landform are a summit below sea level and an independent elevation important?

If a map shows a wedge like spread of sediments after the continental slope what zone may it be?

What is the greatest risk in laying submarine cables without understanding seafloor relief?

In which situation would direct seafloor sampling improve interpretation of mapping data?

Why is seafloor mapping useful for reducing natural hazard risk?

At expert level what is the most appropriate way to read an ocean floor map?

Quiz result

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Mapping of the ocean floor

Quiz this set

Which option gives the strongest set of evidence for seafloor spreading?

What was the scientific weakness of old rope based sounding compared with modern sonar?

Why is oceanic crust generally not found as old as very ancient continental crust?

If numerous small highs are spread over an abyssal plain on a bathymetric map what conclusion is appropriate?

If ages of a seamount chain increase progressively in one direction what process may it indicate?

Which problem of Wegener's continental drift theory began to be addressed by ocean floor mapping?

In which situation would isobaths most clearly identify the continental slope?

Which option gives the correct interpretation of the deep ocean floor?

If bathymetric data has good vertical accuracy but wrong horizontal position what will be the main problem?

If a high resolution seafloor image shows broken sediments slumps and debris deposits on a slope what geohazard can be identified?

Thin sediment cover and high heat flow near a ridge together indicate which condition?

Which map evidence shows that the ocean floor is renewed over time?

For which two reasons is detailed mapping of shallow continental shelf especially important?

In which situation might a bathymetric map lead to confusion between a trench and an abyssal plain?

When a belt of volcanic islands occurs near a deep sea trench what is the most scientific cause?

If isobaths in an ocean basin form nearly circular closed lines with a shallower centre what feature is likely present?

On a seafloor map if a long narrow deep feature has intense earthquakes nearby which conclusion should be avoided?

Why can colour classification in an ocean floor map influence interpretation?

Why is technology like global positioning system necessary in ocean floor mapping?

For identifying which oceanic landform are a summit below sea level and an independent elevation important?

If a map shows a wedge like spread of sediments after the continental slope what zone may it be?

What is the greatest risk in laying submarine cables without understanding seafloor relief?

In which situation would direct seafloor sampling improve interpretation of mapping data?

Why is seafloor mapping useful for reducing natural hazard risk?

At expert level what is the most appropriate way to read an ocean floor map?

Quiz result

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