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 An Introduction to the World's Oceans, 10/e
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 Circulation and Ocean Structure

# Multiple Choice Quiz

 1 The oceans have a well-mixed surface layer approximately ____ meters thick. A) 10 B) 50 C) 100 D) 200 2 If you mix two samples of water with different temperatures and salinities but the same density, you will produce a mixture that has: A) a lower density. B) a higher density. C) the same density as the two samples. D) You cannot predict exactly what will happen. 3 The depth of the mixed layer is greatest in the: A) summer. B) fall. C) winter. D) spring. 4 Downwelling occurs in areas of: A) surface convergence. B) surface divergence. C) strong offshore coastal winds. D) ascending water. 5 Most of the information we have about the Arctic Ocean was collected by scientists from: A) Norway. B) the United States. C) the former Soviet Union. D) Canada. 6 The total cost of running an oceanographic research vessel can be as much as ______ per day. A) \$10,000 B) \$25,000 C) \$50,000 D) \$100,000 7 The Indian Ocean is unique because it: A) has a very high average salinity. B) is the smallest ocean. C) is the deepest ocean. D) is a Southern Hemisphere Ocean. 8 Select the following relationship of water properties that is not correct. A) increased salinity: increased density B) increased temperature: decreased density C) increased temperature: increased salinity D) increased evaporation: increased salinity 9 Overturn occurs when the: A) water column is isopycnal. B) density at the surface is less than the density at depth. C) pycnocline is very pronounced. D) density at depth is less than the density at the surface. 10 Which of the following statements on density structure is not correct? A) Two isothermal bodies of water may have different densities. B) Melting of sea ice produces cold dense fresh water that sinks to the sea floor. C) Storms and disturbances may cause water to become isothermal to greater depths. D) The densest water in the open oceans results from winter cooling and freezing in the Antarctic seas. 11 Thermohaline sinking of dense water occurs: A) at pycnoclines. B) at haloclines. C) at surface divergence zones. D) along downwelling zones. 12 Upwelling of deep water: A) provides nutrient rich water to marine plant life. B) moves very rapidly relative to surface currents. C) can be found at surface convergence zones. D) is not a thermohaline circulation mechanism. 13 Isotopic tracers in the oceans: A) can provide a measure of the rate of movement of water in the oceans. B) make use of radioactive substances produced in atmospheric nuclear tests. C) provide data for modeling water pathways in the oceans. D) are accurately described by each of the above. 14 The Lomonosov Ridge divides the ___________ Ocean basin. A) Antarctic B) Arctic C) Atlantic D) Indian 15 The densest water in the oceans is ___________ water. A) North Atlantic deep B) Antarctic intermediate C) Antarctic deep D) Antarctic bottom 16 The Arctic Ocean: A) has the narrowest shelves of any ocean basin. B) has a density controlled more by salinity differences than temperature differences. C) interacts more with the Pacific than the Atlantic oceans. D) is described by A, B, and C. 17 Which of the following statements on ocean layering is not correct? A) Water types change characteristics rapidly. B) Horizontal mixing is more efficient than vertical mixing. C) Mediterranean water can still be identified in the middle of the Atlantic. D) The deepest water in the Mediterranean is produced in the Aegean Sea. 18 The water mass identified by one T-S point rather than a curve, is ___________ water. A) North Atlantic deep B) Antarctic intermediate C) Antarctic deep D) Antarctic bottom 19 CTD sensors measure which of the following characteristics? A) chlorophyll B) conductivity C) calcium D) carbon 20 Which type of ocean measurement is not performed by satellites? A) radar altimetry B) oil spill detection C) sea surface temperature D) internal structure acoustic tomography 21 Which of the following statements is true? A) As temperature decreases and salinity decreases, density decreases. B) As temperature increases and salinity increases, density decreases. C) As temperature increases and salinity decreases, density increases. D) As temperature decreases and salinity increases, density increases. 22 An area where temperature rapidly changes with depth is known as the: A) thermocline. B) pycnocline. C) halocline. D) isocline. 23 Which of the following is true about the relationships between temperature, salinity, and density? A) Salinity has a greater affect on density than temperature. B) Temperature has a greater affect on density than salinity. C) Temperature and salinity play equal roles in affecting density. D) Neither temperature nor salinity affects density. 24 The densest water body in the oceans is: A) North Atlantic deep water. B) Antarctic intermediate water. C) Antarctic bottom water. D) South Atlantic surface water.

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