What type of organism is Antarctic krill?
Answer: Euphausiid
What type of organism is Antarctic krill?
Answer: Euphausiid
Answer: Euphausiid
Some coral colonies remove calcium carbonate from seawater and deposit it as limestone in the reef. What is the range of yearly accumulation of limestone in a typical square mile of a reef?
Some coral colonies remove calcium carbonate from seawater and deposit it as limestone in the reef. What is the range of yearly accumulation of limestone in a typical square mile of a reef?
Answer: 100,00 to 500,000 tons
Which organism reproduces by shedding gametes into the sea, then depending upon thee chance union of egg and sperm?
Which organism reproduces by shedding gametes into the sea, then depending upon thee chance union of egg and sperm?
Answer: Purple sea urchin
What is the carbon source for marine autotrophic organisms?
What is the carbon source for marine autotrophic organisms?
W)inorganic carbon
X) phytoplankton
Y) dissolve organic carbon
Z) particulate organic carbon
Answer: W) Inorganic carbon
What is an autotroph?
What is an autotroph?
W)a generator of its own food
X) a producer of reduced carbon
Y) a consumer of plants
Z) a consumer of animals
Answer: W) A generator of its own food
What type of symbiotic relationship exists between zooxanthellae and coral?
What type of symbiotic relationship exists between zooxanthellae and coral?
W)parasitism
X) mutualism
Y) commensalism
Z) amensalism
Answer: X) Mutualism
What is the most important source of nutrients for phytoplankton in the open ocean?
What is the most important source of nutrients for phytoplankton in the open ocean?
W)salt fingers
X) upwelling
Y) photic zone recycling
Z) mixing by internal waves
Answer: Y) Photic zone recycling
Which of the following is the result of the oxidation of organic matter in sediments?
Which of the following is the result of the oxidation of organic matter in sediments?
W)loss of clay particles
X) consumption of oxygen
Y) production of oxygen
Z) hydrothermal vent activity
Answer: X) Consumption of oxygen
Which is an example of a neritic environment?
Which is an example of a neritic environment?
W)an estuary
X) the sedimentary surface of the seafloor
Y) coastal ocean waters
Z) the surface waters of the Great Lakes
Answer: Y) Coastal ocean waters
In which suborder are slow swimming whales, which also lack teeth, classified?
In which suborder are slow swimming whales, which also lack teeth, classified?
W)odontoceti
X) cetacea
Y) mysticeti
Z) orcinae
Answer: Y) Mysticeti
Which of the following is the cause of red tides?
Which of the following is the cause of red tides?
W)planktonic bloom of red-colored microorganisms
X) excess of iron compounds in the water
Y) photosynthesis, combining carbon and water in sunlight
Z) organic dyes emitted by nudibranchs and neustonic organisms
Answer: W) Planktonic bloom of red-colored microorganisms
Where does primary production by marine plants occur?
Where does primary production by marine plants occur?
W)occurs at all depths
X) is limited to the upper 200 meters of the sea
Y) is limited to the aphotic zone
Z) occurs below the compensation depth only
Answer: X) is limited to the upper 200 meters of the sea
Which stimuli result in adaptations such as vertical migration and countershading in marine life?
Which stimuli result in adaptations such as vertical migration and countershading in marine life?
W) light
X) pressure
Y) temperature
Z) salinity
Answer: W) Light
Which wavelength of light could deep-sea animals most likely detect with their eyes?
Which wavelength of light could deep-sea animals most likely detect with their eyes?
W) Infrared
X) Visible light
Y) Ultraviolet
Z) Gamma rays
Answer: W) Infrared
Which of the following organisms does NOT accumulate calcium carbonate?
Which of the following organisms does NOT accumulate calcium carbonate?
W) Coccolithophores
X) Pteropods
Y) Foraminifera
Z) Cladocera
Answer: Z) Cladocera
What is primary productivity a measure of?
What is primary productivity a measure of?
W) Standing crop
X) Life expectancy
Y) Rate of birth minus rate of death
Z) Rate of production of organic carbon
Answer: Z) rate of production of organic carbon
What are the two best developed senses in cetaceans?
What are the two best developed senses in cetaceans?
W) Sight and smell
X) Taste and hearing
Y) Taste and smell
Z) Sight and hearing
Answer: Z) Sight and hearing
Where does the band of coral reef development extend to higher latitudes?
Where does the band of coral reef development extend to higher latitudes?
W) Atlantic Ocean
X) Pacific Ocean
Y) The east side of all oceans
Z) The west side of all oceans
Answer: Z) The west side of all oceans
How can you quickly determine the sex of most species of crabs?
How can you quickly determine the sex of most species of crabs?
W) External sex organs
X) Relative size of the pincher claws
Y) The shape of the abdominal plate
Z) the color of the eyes
Answer: Y) The shape of the abdominal plate
How many years does it take for an amount of water equal to the entire volume of the ocean to cycle through hydrothermal vents?
How many years does it take for an amount of water equal to the entire volume of the ocean to cycle through hydrothermal vents?
W)1000 years
X) 100,000 years
Y) 10 million years
Z) 1 billion years
Answer: Y
Why are chelators important to marine organisms?
Why are chelators important to marine organisms?
W) They absorb sunlight
X) They bind trace metals
Y) They prevent sinking
Z) They enhance feeding
Answer: X
What environmentally harmful isotope was produced during the 1954 'Bravo' thermonuclear detonation at Bikini Atoll?
What environmentally harmful isotope was produced during the 1954 'Bravo' thermonuclear detonation at Bikini Atoll?
W)Uranium 238
X) Nitrogen-15
Y) Cesium 137
Z) Carbon14
Answer: Y
Which two molecules increase in concentration in deep water as it travels from the North Atlantic to the North Pacific ocean?
Which two molecules increase in concentration in deep water as it travels from the North Atlantic to the North Pacific ocean?
W)Oxygen and nitrate
X) Nitrate and carbon dioxide
Y) Oxygen and carbon dioxide
Z) Carbon dioxide and carbon-14
Answer: X
What is the most abundant excess volatile on Earth?
What is the most abundant excess volatile on Earth?
W)Carbon dioxide
X) Water Vapor
Y) Chlorine
Z) Nitrogen
Answer: X
Which of the following primarily causes the variation in the salinity of seawater?
Which of the following primarily causes the variation in the salinity of seawater?
W)Carbon dioxide
X) Sodium ions
Y) Chloride ions
Z) Water molecules
Answer: Z
Which three factors are responsible for hypoxic zones in the northern Gulf of Mexico?
Which three factors are responsible for hypoxic zones in the northern Gulf of Mexico?
W)Pesticide-laden runoff, high winds, and strong currents
X) Coastal erosion, sedimentation, and spring overturn
Y) High river runoff, vertical stratification, and high biological oxygen demand
Z) Vessel sewage discharges, nutrient elevation, and upwelling
Answer: Y
What does a chemical equation with a negative delta G indicate?
What does a chemical equation with a negative delta G indicate?
W)Releasing energy and not spontaneous
X) Endothermic and spontaneous
Y) Exothermic and may be spontaneous
Z) Using energy and not spontaneous
Answer: Y
In methane hydrates, what traps the methane gas?
In methane hydrates, what traps the methane gas?
W)Carbon dioxide
X) Water
Y) Argon
Z) Oxygen
Answer: X
What is the salinity range where you would find the turbidity maximum in an estuary?
What is the salinity range where you would find the turbidity maximum in an estuary?
W)1 to 5 ppm
X) 5 to 15 ppm
Y) 15 to ppm
Z) 25 to 35 ppm
Answer: W
What does the Law of Constancy of Composition state?
What does the Law of Constancy of Composition state?
W)The relative proportion of ions and their concentrations are virtually constant
X) The relative proportions of ions are virtually constant, but their concentrations may vary
Y) Changes in salinity will result in changes in the ionic concentration
Z) Ionic concentrations remain fairly constant regardless of the local environmental conditions
Answer: X)
Generally, what are conservative elements in seawater?
Generally, what are conservative elements in seawater?
W) Major components
X) Minor components
Y) Easily dissolved
Z) Used in photosynthetic activity
Answer: W)
How does increasing atmospheric pressure affect the boiling point of water?
How does increasing atmospheric pressure affect the boiling point of water?
W)The boiling point decreases
X) The boiling point does not change
Y) The boiling point increases
Z) Water does not boil at higher pressures
Answer: Y)
Which type of heat changes the state of a substance, but does not raise its temperature?
Which type of heat changes the state of a substance, but does not raise its temperature?
W) Transforming heat
X) Sensible heat
Y) Latent heat
Z) Converting heat
Answer: Y)
What is the average salinity of the world's oceans?
What is the average salinity of the world's oceans?
W)10
X) 25
Y) 35
Z) 50
Answer: Y
What type of reaction is cellular respiration considered?
What type of reaction is cellular respiration considered?
W)Endothermic
X) Catalytic
Y) Inorganic
Z) Exothermic
Answer: Z
How is organic matter produced in the ocean classified?
How is organic matter produced in the ocean classified?
W)Allochthnonous
X) Autochthonous
Y) Terrigenous
Z) Hydrogenous
Answer: X
Lead-210 with a half-life of 22 years cannot be used to determine the sedimentation of deep-ocean sediments because:
Lead-210 with a half-life of 22 years cannot be used to determine the sedimentation of deep-ocean sediments because:
W)its half-life is too short
X) its half-life is too long
Y) its concentration in these sediments is too high to measure
Z) its concentration in these sediments is too low to measure
Answer: W
Which of the following is a component of siliceous ooze?
Which of the following is a component of siliceous ooze?
W)Foraminifers
X) Radiolarians
Y) Pteropods
Z) coccolithophores
Answer: X
What is an example of a hydrogenous sediment?
What is an example of a hydrogenous sediment?
W)Manganese
X) Calcareous oozes
Y) Siliceous oozes
Z) Brown Red clays
Answer: W
What is the range of fine sand, on the Wentworth scale of particle size?
What is the range of fine sand, on the Wentworth scale of particle size?
W)0.5 to 1 millimeter
X) 0.25 to 0.5 millimeter
Y) 0.125 to 0.25 millimeter
Z) 0.05 to 0.125 millimeter
Answer: Y
Which of the following is NOT a type of marine phytoplankton that makes up a major portion of marine sediments?
Which of the following is NOT a type of marine phytoplankton that makes up a major portion of marine sediments?
W)Dinoflagellates
X) Diatoms
Y) Coccolithophorids
Z) Radiolarians
Answer: W
Which of the following is NOT a scientific classification of a coral reef type?
Which of the following is NOT a scientific classification of a coral reef type?
W)Fringing reef
X) Nearshore reef
Y) Barrier reef
Z) Atoll reef
Answer: X
Where is the feature called the Moho situated?
Where is the feature called the Moho situated?
W)Within the asthenosphere
X) Beneath the asthenosphere
Y) Within the lithosphere
Z) Between the lithosphere and the asthenosphere
Answer: Y
What type of plate is the San Andreas fault?
What type of plate is the San Andreas fault?
W) Convergent plate boundary
X) Divergent plate boundary
Y) Transform plate boundary
Z) Transcurrent plate boundary
Answer: Y
Approximately, when did the North America began to separate from Europe?
Approximately, when did the North America began to separate from Europe?
W)10 million years ago
X) 50 million years ago
Y) 200 million years ago
Z) 1 billion years ago
Answer: Y
When does the higher berm on a beach form?
When does the higher berm on a beach form?
W)During neap tides
X) During the summer in times of low energy waves
Y) During winter conditions
Z) During high wave conditions at low tide
Answer: Y
What type of deposits are formed by conditions no longer existing in that area?
What type of deposits are formed by conditions no longer existing in that area?
W)Relict sediments
X) Anomalous sediments
Y) Defunct sediments
Z) Derivative sediments
Answer: W
Which of the following would be used to show the relationship between the height of the land and the depths of the ocean basins?
Which of the following would be used to show the relationship between the height of the land and the depths of the ocean basins?
W)Hypsographic (hip-soh-gra-fic) curve
X) Hypsometric diagram
Y) Mercator projection
Z) Elevation matrix
Answer: W
Where does the relative motion of a transform fault occur?
Where does the relative motion of a transform fault occur?
W)Outside the adjacent ridge axes
X) West of the adjacent ridge axes
Y) Between the adjacent ridge axes
Z) East of the adjacent ridge axes
Answer: Y
What area did Project FAMOUS explore?
What area did Project FAMOUS explore?
W)Atlantic and Pacific Oceans
X) Indian Ocean abyssal plain
Y) East Pacific Rise
Z) Mid-Atlantic Ridge rift valley
Answer: Z
Which compelling piece of evidence supported the theory of seafloor spreading?
Which compelling piece of evidence supported the theory of seafloor spreading?
W) The discovery and mapping of magnetic stripes on the seafloor
X) The discovery of deep earthquakes along the Pacific Rim by Charles Richter
Y) The recordings of submarine volcanic activity along mid-ocean ridges in the 1970s
Z) Sir Edward Bullard's geographic fit of the continents
Answer: W
Which of the following is NOT a clay mineral found in marine sediments?
Which of the following is NOT a clay mineral found in marine sediments?
W)Chlorite
X) Illite
Y) Muscovite
Z) Kaolinite
Answer: Y
Which of the following was the basis of geologists' current estimate of the Earth's age?
Which of the following was the basis of geologists' current estimate of the Earth's age?
W)Moon rocks and meteorites
X) Fossils
Y) Continental rocks
Z) Ocean floor rocks
Answer: W
What is the name of the Eastern Boundary current in the South Atlantic?
What is the name of the Eastern Boundary current in the South Atlantic?
W)West Wind Drift
X) South Equatorial Current
Y) Benguela Current
Z) Canary Current
Answer: Z
Which best describes the concept of hurricanes as heat transfer engines?
Which best describes the concept of hurricanes as heat transfer engines?
W)Transfer the sun's energy from temperate zones to polar zones
X) Transfer the sun's energy from the tropic to temperate zones
Y) Transfer the sun's energy from the temperate zones to the tropics
Z) Transfer the sun's energy from the northern to the southern hemispheres
Answer: X
What is the second largest reservoir, by volume, on the planet?
What is the second largest reservoir, by volume, on the planet?
W)The atmosphere
X) Freshwater lakes
Y) Ice sheets and glaciers
Z) Groundwater
Answer: Y
What is a wind blowing from the northeast to the southwest called?
What is a wind blowing from the northeast to the southwest called?
W)Northwest
X) Northerly
Y) Northeast
Z) Southwest
Answer: Y
What is the depth of the water a shallow-water wave is traveling in, by definition?
What is the depth of the water a shallow-water wave is traveling in, by definition?
W)Less than one-twentieth of the wavelength
X) less than one-half of the wavelength
Y) Less than the wavelength
Z) Less than twice wavelength
Answer: W
Which name is given to the wind band between the horse latitudes and the doldrums in the Southern Hemisphere?
Which name is given to the wind band between the horse latitudes and the doldrums in the Southern Hemisphere?
W)Prevailing westerlies
X) Northeast trade winds
Y) Southeast trade winds
Z) Polar easterlies
Answer: Y
What is the sum of planetary and relative vorticity known as?
What is the sum of planetary and relative vorticity known as?
W)Absolute vorticity
X) Momentum vorticity
Y) Positive vorticity
Z) Wind vorticity
Answer: W
Which of the following results in the high speed of sound in bottom waters?
Which of the following results in the high speed of sound in bottom waters?
W)Low salinity
X) High temperature
Y) Low pressure
Z) Increased density and pressure
Answer: Z
Which of the following best defines the wavelength of a wave?
Which of the following best defines the wavelength of a wave?
W)It is the distance from crest to through measure horizontally
X) It is the distance from crest to trough measured vertically
Y) It is the time it takes for two troughs to pass a stationary point
Z) It is the smallest distance between two crests
Answer: Z
Which of the following is an implication of surface divergence?
Which of the following is an implication of surface divergence?
W)Horizontal mixing must occur as a consequence
X) Biological productivity will decrease
Y) Vertical circulation must occur as a consequence
Z) Productivity remains constant
Answer: Y
Which of the following is NOT TRUE about Langmuir circulation?
Which of the following is NOT TRUE about Langmuir circulation?
W) It is produced by the wind
X) It was first observed in the Sargasso Sea
Y) It occurs only where there is coastal upwelling
Z) It results in streaks of foam and debris along the surface of the ocean
Answer: Y
What is the name for the point at which the moon is farthest away from the Earth during its orbit?
What is the name for the point at which the moon is farthest away from the Earth during its orbit?
W)Perigee
X) Apogee
Y) Neap
Z) Equinox
Answer: X
Which of the following will result in an increase in the speed of sound transmission in ocean water?
Which of the following will result in an increase in the speed of sound transmission in ocean water?
W)Increased temperature
X) Decreased salinity
Y) Decreased pressure
Z) Increased turbulence
Answer: W
Which characteristic does not describe a tsunami?
Which characteristic does not describe a tsunami?
W)It can pass across the deep ocean without being noticed
X) It can be a few meter high with a length extending over 750 km per hour in the deep ocean
Y) It can propagate at a speed exceeding 700 kilometers
Z) It is dangerous when one encounters a tsunami in the deep ocean
Answer: Z
What is the speed of a wave equal to ?
What is the speed of a wave equal to ?
W)Height
X) Amplitude divided by the wavelength
Y) Wavelength divided by the frequency
Z) Wavelength divided by the period
Answer: Z
Which natural phenomenon does not cause a tsunami?
Which natural phenomenon does not cause a tsunami?
W)Earthquake
X) Volcanic eruption
Y) Landslide
Z) Tide
Answer: Z
Which best describes the behavior of high-energy waves of winter storms?
Which best describes the behavior of high-energy waves of winter storms?
W)Move sand from offshore bars onto the beach
X) Move sand spits and tombolos
Y) Build sand spits and tombolos
Z) Hold sand on the beach and keep the beach stable
Answer: X
What happens to the speed of sound when there is an increase in temperature, pressure, or salinity?
What happens to the speed of sound when there is an increase in temperature, pressure, or salinity?
W)Increases
X) decreases
Y) Remains the same
Z) Increases or decreases depending on factors more influential than temperature, pressure, and salinity
Answer: W
If someone drops a cork into the ocean, about 10 km from shore, how long does it to take for the cork to move to the shore?
If someone drops a cork into the ocean, about 10 km from shore, how long does it to take for the cork to move to the shore?
W)A few hours
X) 1 day
Y) 1 week
Z) Maybe never
Answer: Z
What do underwater earthquakes, landslides, volcanic eruptions, or explosions generate?
What do underwater earthquakes, landslides, volcanic eruptions, or explosions generate?
W)Freak waves
X) Whirlpools
Y) Tsunamis
Z) Eddies
Answer: Y
The methods of electrodialysis, reverse osmosis, and ion exchange are used for which purpose?
The methods of electrodialysis, reverse osmosis, and ion exchange are used for which purpose?
W)Determining water salinity
X) Measuring current velocity
Y) Desalination
Z) Determining residence time
Answer: Y
What is ConShelf III?
What is ConShelf III?
W)A manned submersible
X) An underwater habitat
Y) A remotely operated vehicle
Z) An autonomous explorer
Answer: X
How does a Global Positioning System receiver calculate the distance to a GPS satellite?
How does a Global Positioning System receiver calculate the distance to a GPS satellite?
W) By transmitting and receiving a radar signal aimed at the satellites
X) Using trigonometry and a radio direction finder aimed at multiple satellites
Y) By detecting the Doppler shifts in the satellite's transmission
Z) By receiving a time-stamped signal from the satellite
Answer: Z
Which Navy-developed model will give a global analyses and forecast, out to 6 days, for significant wave height and direction?
Which Navy-developed model will give a global analyses and forecast, out to 6 days, for significant wave height and direction?
W)NOGAPS (No-Gaps)
X) COAMPS (Co-Amps)
Y) WAM (Wham)
Z) STWAVE (S-T-Wave)
Answer: Y
What does the gyroscopic compass do?
What does the gyroscopic compass do?
W)Calculates magnetic variation
X) Senses the earth's rotation and orients its axis of rotation parallel to the earths axis of rotation
Y) Utilizes the relatively long term fixed positions of the stars
Z) Indicates latitude and longitude
Answer: X
What device can be used to map sixty kilometer wide strips of ocean floor?
What device can be used to map sixty kilometer wide strips of ocean floor?
W)Side-scanning sonar systems
X) Echo sounders
Y) Explosion seismic surveys
Z) Altimeter remote sensing routines
Answer: W
Which of the following resulted in the production of an accurate map of the ocean floor?
Which of the following resulted in the production of an accurate map of the ocean floor?
W)Enough soundings using a weight had been made
X) Sound waves were discovered in water
Y) Echo sounding was developed
Z) Oceanographers used sound to locate submarines
Answer: Y
Which of these oceanographic vehicles is the only autonomous vehicle?
Which of these oceanographic vehicles is the only autonomous vehicle?
W)ALVIN
X) NR-1
Y) ABE
Z) NAUTILE
Answer: Y
What commercial fishing method utilizes multiple baited hooks, suspended beneath the ocean surface?
What commercial fishing method utilizes multiple baited hooks, suspended beneath the ocean surface?
W)Trolling
X) Trawling
Y) Seining
Z) Longlining
Answer: Z
Who discovered that the White Cliffs of Dover contained layers of coccolithophorids?
Who discovered that the White Cliffs of Dover contained layers of coccolithophorids?
W)Robert Hooke
X) Robert Brown
Y) Anton van Leeuwenhoek
Z) Camillio Golgi
Answer: Y
Which activity has the least impact on seagrass communities?
Which activity has the least impact on seagrass communities?
W)Overharvesting
X) Watershed development
Y) Boating
Z) Fertilizing farmlands
Answer: W
Who first developed the concepts of latitude and longitude?
Who first developed the concepts of latitude and longitude?
W)Eratosthenes
X) Pythagoras
Y) Ptolemy
Z) Prince Henry the Navigator
Answer: W
Which of the following is prohibited in US marine sanctuaries?
Which of the following is prohibited in US marine sanctuaries?
W)Swimming
X) Fishing
Y) Dredging
Z) Shipping
Answer: Y
Which submarine first traveled under the ice pack?
Which submarine first traveled under the ice pack?
W)USS Nautilus in 1932
X) USS Nautilus in 1958
Y) USS Skate in 1958
Z) USS Seadragon in 1960
Answer: X
Which ocean-related disaster caused the greatest loss of life in US history?
Which ocean-related disaster caused the greatest loss of life in US history?
W)Hurricane Andrew of 1992
X) The Johnson Flood of 1889
Y) The Galveston Hurricane of 1900
Z) The San Francisco Earthquake of 1906
Answer: Y
Which of the following is the greatest threat to most dune plants?
Which of the following is the greatest threat to most dune plants?
W)Human traffic
X) Hot summer temperatures
Y) Wind blown sand
Z) Salt spray
Answer: W
Which man accomplished the first prevention of scurvy on his voyage?
Which man accomplished the first prevention of scurvy on his voyage?
W)Vasco de Gama
X) Nathanial Palmer
Y) James Cook
Z) Ferdinand Magellan
Answer: Y
What is the name of the strait between Australia and Tasmania?
What is the name of the strait between Australia and Tasmania?
W)Cook
X) Bass
Y) Torres
Z) Brisbane
Answer: X
Exclusive Economic Zones cover what percent of the seafloor?
Exclusive Economic Zones cover what percent of the seafloor?
W)16 percent
X) 24 percent
Y) 36 percent
Z) 52 percent
Answer: Y
What is a geoid?
What is a geoid?
W)An oblate spheroid
X) A sphere with an envelope of fluids
Y) A rotating sphere
Z) The shape of the earth
Answer: Z
Near which city is the US National Hurricane Center located
Near which city is the US National Hurricane Center located
W)Cape Canaveral
X) Houston
Y) Miami
Z) Tampa
Answer: Y
What is your latitudinal position at dusk when the smallest angle between the horizon and the North Star (Polaris) is 22 degrees?
What is your latitudinal position at dusk when the smallest angle between the horizon and the North Star (Polaris) is 22 degrees?
W)44 degrees N
X) 78 degrees N
Y) 46 degrees N
Z) 22 degrees N
Answer: Z
What was a major flaw in the 150AD maps drawn by Ptolemy?
What was a major flaw in the 150AD maps drawn by Ptolemy?
W)Distortion of surface currents in the Mediterranean
X) Distortion of distance with longitude
Y) Distortion of Distance with latitude
Z) Distortion of topographic features
Answer: X
At which latitude is there the most ocean and least amount of land present?
At which latitude is there the most ocean and least amount of land present?
W)60 degrees South
X) 90 degrees South
Y) 30 degrees North
Z) 60 degrees North
Answer: W
From what does the Sargasso Sea, located within the North Atlantic gyre, gets its name?
From what does the Sargasso Sea, located within the North Atlantic gyre, gets its name?
W)A Portuguese word for 'warm water'
X) A type of seaweed that is common there
Y) A Norse word for 'calm seas'
Z) The unusual clarity of its waters
Answer: X
What is the world's largest reef complex?
What is the world's largest reef complex?
W)Florida Keys Reef Tract
X) Australian Great Barrier Reef
Y) Belize Barrier Reef
Z) Palau Reef Tract
Answer: X
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