Mapping of the ocean floor

Question 1HardLevel 1

In ocean-floor mapping by echo sounding, why is the travel time of sound divided by two while calculating depth?

ASound travels to the sea floor and returnsBSound moves only on the water surfaceCSound speed is measured in airDSea floor is always flat

Question 2HardLevel 1

Why is the continental shelf considered the most useful part of the ocean?

AIt is deepest and without lightBIt is rich in minerals, fisheries and petroleum resourcesCIt is made only of volcanic islandsDIt is steeper than oceanic trenches

Question 3HardLevel 1

What is the main identifying feature of the continental slope in ocean-floor relief?

AVery broad and nearly flat partBShallow part adjoining the coastCSteep zone between shelf and deep-sea plainDCrest of a mid-oceanic ridge

Question 4HardLevel 1

If a long submarine mountain chain with a central rift is found in an oceanic area, which feature does it indicate?

AContinental shelfBDeep-sea plainCOceanic trenchDMid-oceanic ridge

Question 5HardLevel 1

Why does mapping oceanic trenches help in understanding plate boundaries?

ABecause they are often linked with convergent boundaries and subduction zonesBBecause they form only in calm seasCBecause they occur only in the middle of all oceansDBecause they always form on continental shelves

Question 6HardLevel 1

The very flat appearance of abyssal plains is mainly the result of which process?

AFormation of high lava conesBFilling of irregular surface by sedimentsCCutting of mountains by glaciersDDirect erosion by coastal waves

Question 7HardLevel 1

Which is the most accurate difference between a seamount and a guyot?

ASeamount has flat top and guyot is pointedBBoth are formed only by riversCGuyot has a flat top while seamount is generally conicalDGuyot occurs only on continental slope

Question 8HardLevel 1

In ocean-floor mapping, what are lines joining points of equal ocean depth called?

AIsobarsBIsothermsCIsohyetsDIsobaths

Question 9HardLevel 1

How did echo sounders change the older idea about the ocean floor?

AThey showed that the ocean floor has complex reliefBThey proved all oceans are shallowCThey showed ocean water is stationaryDThey measured only coastal sand

Question 10HardLevel 1

Where is the continental shelf generally wider?

AIn front of active plate marginsBNear passive continental margins and mouths of large riversCOnly on mid-oceanic ridgesDBelow all oceanic trenches

Question 11HardLevel 1

Why are submarine canyons considered important landforms on the continental slope?

AThey are cut only by windBThey always form from coral reefsCThey indicate deep erosional valleys inside the sea similar to land riversDThey make ocean water fresh

Question 12HardLevel 1

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

AIt gives depth of only one pointBIt measures atmosphere at light speedCIt directly counts fish on the sea floorDIt gives depth and shape over a wide swath at once

Question 13HardLevel 1

If isobaths are very close together on a map, what can be inferred about that oceanic area?

AThe slope is steepBThe slope is zeroCThe water is completely freshDDepth is same everywhere

Question 14HardLevel 1

Symmetry of magnetic stripes on both sides of a mid-oceanic ridge strengthens which explanation?

AOceans are stationary pitsBNew crust forms through sea-floor spreadingCContinental shelf is the deepest partDAbyssal plains are always volcanic peaks

Question 15HardLevel 1

While mapping the age of the ocean floor, where are the youngest rocks generally found?

ANear continental coastsBOn trench floorsCNear mid-oceanic ridgesDIn the farthest parts of abyssal plains

Question 16HardLevel 1

How does the spatial relation of trenches and mid-oceanic ridges explain the life cycle of oceanic crust?

ACrust forms at ridges and is destroyed or subducted at trenchesBCrust only rises at both placesCBoth ridges and trenches are made by continental riversDNew crust forms at trenches and sediments collect at ridges

Question 17HardLevel 1

What is the main reason for higher biological productivity on continental shelves than in deep ocean basins?

ALight and nutrients are relatively more available hereBWater is never moving hereCSunlight never reaches hereDOnly lava accumulates here

Question 18HardLevel 1

Which sequence correctly shows the usual relief order from coast toward deep ocean?

ATrench, shelf, slope, plainBShelf, continental slope, abyssal plain, oceanic trenchCMid-ridge, coast, shelf, plainDGuyot, coast, river valley, shelf

Question 19HardLevel 1

What can mapping sediment thickness on the ocean floor indicate in plate tectonics?

ARelative age of crust and distance from ridgeBDaily pattern of air pressureCTemperature of the lunar surfaceDWidth of terrestrial deserts

Question 20HardLevel 1

On what basis does satellite altimetry estimate the shape of the ocean floor?

AFrom the smell of sea floorBFrom tiny sea-surface height variations and gravitational effectsCOnly from coastal tree heightDFrom fish colour

Question 21HardLevel 1

Why is only coastal depth measurement not enough to understand the real structure of an ocean basin?

ABecause deep parts include diverse forms such as ridges, plains, mountains and trenchesBBecause the sea floor has no reliefCBecause coastal water is always like mid-ocean waterDBecause oceans are only river valleys

Question 22HardLevel 1

What is a map showing the elevations and depths of the ocean floor generally called?

APolitical mapBBathymetric mapCWeather mapDPopulation map

Question 23HardLevel 1

In which situation would it be most appropriate to identify an oceanic area as an abyssal plain?

ADepth is low, coast is near and fish are abundantBCentral rift and sharp volcanic rise are presentCIt is very deep, broad and nearly flat sedimented areaDIts summit rises above sea level

Question 24HardLevel 1

Why is the continental rise considered a zone between the continental slope and abyssal plain?

ABecause the slope gradually decreases and sediments accumulate hereBBecause it always remains above sea levelCBecause it is made only of coralDBecause it is another name for mid-oceanic ridge

Question 25HardLevel 1

Before detailed ocean-floor mapping, which wrong belief about the ocean floor was common?

AIt is diverse and mountainous like landBIt is almost flat and featurelessCIt contains very deep trenches tooDIt contains long ridge mountain chains

Mapping of the ocean floor

Quiz this set

In ocean-floor mapping by echo sounding, why is the travel time of sound divided by two while calculating depth?

Why is the continental shelf considered the most useful part of the ocean?

What is the main identifying feature of the continental slope in ocean-floor relief?

If a long submarine mountain chain with a central rift is found in an oceanic area, which feature does it indicate?

Why does mapping oceanic trenches help in understanding plate boundaries?

The very flat appearance of abyssal plains is mainly the result of which process?

Which is the most accurate difference between a seamount and a guyot?

In ocean-floor mapping, what are lines joining points of equal ocean depth called?

How did echo sounders change the older idea about the ocean floor?

Where is the continental shelf generally wider?

Why are submarine canyons considered important landforms on the continental slope?

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

If isobaths are very close together on a map, what can be inferred about that oceanic area?

Symmetry of magnetic stripes on both sides of a mid-oceanic ridge strengthens which explanation?

While mapping the age of the ocean floor, where are the youngest rocks generally found?

How does the spatial relation of trenches and mid-oceanic ridges explain the life cycle of oceanic crust?

What is the main reason for higher biological productivity on continental shelves than in deep ocean basins?

Which sequence correctly shows the usual relief order from coast toward deep ocean?

What can mapping sediment thickness on the ocean floor indicate in plate tectonics?

On what basis does satellite altimetry estimate the shape of the ocean floor?

Why is only coastal depth measurement not enough to understand the real structure of an ocean basin?

What is a map showing the elevations and depths of the ocean floor generally called?

In which situation would it be most appropriate to identify an oceanic area as an abyssal plain?

Why is the continental rise considered a zone between the continental slope and abyssal plain?

Before detailed ocean-floor mapping, which wrong belief about the ocean floor was common?

Quiz result

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Mapping of the ocean floor

Quiz this set

In ocean-floor mapping by echo sounding, why is the travel time of sound divided by two while calculating depth?

Why is the continental shelf considered the most useful part of the ocean?

What is the main identifying feature of the continental slope in ocean-floor relief?

If a long submarine mountain chain with a central rift is found in an oceanic area, which feature does it indicate?

Why does mapping oceanic trenches help in understanding plate boundaries?

The very flat appearance of abyssal plains is mainly the result of which process?

Which is the most accurate difference between a seamount and a guyot?

In ocean-floor mapping, what are lines joining points of equal ocean depth called?

How did echo sounders change the older idea about the ocean floor?

Where is the continental shelf generally wider?

Why are submarine canyons considered important landforms on the continental slope?

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

If isobaths are very close together on a map, what can be inferred about that oceanic area?

Symmetry of magnetic stripes on both sides of a mid-oceanic ridge strengthens which explanation?

While mapping the age of the ocean floor, where are the youngest rocks generally found?

How does the spatial relation of trenches and mid-oceanic ridges explain the life cycle of oceanic crust?

What is the main reason for higher biological productivity on continental shelves than in deep ocean basins?

Which sequence correctly shows the usual relief order from coast toward deep ocean?

What can mapping sediment thickness on the ocean floor indicate in plate tectonics?

On what basis does satellite altimetry estimate the shape of the ocean floor?

Why is only coastal depth measurement not enough to understand the real structure of an ocean basin?

What is a map showing the elevations and depths of the ocean floor generally called?

In which situation would it be most appropriate to identify an oceanic area as an abyssal plain?

Why is the continental rise considered a zone between the continental slope and abyssal plain?

Before detailed ocean-floor mapping, which wrong belief about the ocean floor was common?

Quiz result

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