Other questions in this quiz

2. Why do dissolved oxygen concentrations decrease as deep water formed in the Atlantic ages during its transport to the Pacific Ocean?

  • Because the oxygen diffuses up to the surface and out into the atmosphere faster than it is transported in the bottom water currents moving towards the Pacific Ocean.
  • Oxygen is adsorbed by inorganic particles
  • Bacteria organisms use oxygen during respiration/decomposition of organic matter
  • Because the deep water warms significantly beteween the Atlantic and Pacific Ocean.

3. The remains of which of the following type of planktonic organism are most likely to be remineralised (added back to seawater) and least likely to reach and accumulate on the ocean floor after death/being consumed

  • Coccolithophores
  • Organic walled phytoplankton
  • Diatoms
  • Radiolarians

4. Which of the following statements is FALSE?

  • The residence time of an element in seawater can be estimated by dividing its mass in the ocean by its annual input from rivers
  • The major ions in seawater have a residence time longer than average ocean mixing time.
  • That the chemical composition of the oceans is in steady state means that the rate of addition of dissolved constituents to seawater is balanced by their rate of removal, so that their concentrations do not change significantly with time.
  • A constituent with an oceanic residence time of 100 years will be uniformly mixed throughout the oceans.

5. Which of the following statements is FALSE?

  • Most of the particulate matter falling to the ocean floor is from minerals supplied as wind borne dust.
  • The concensus between marine scientists is that the oceans are chemically in a steady state
  • Much of our information about the nature and distribution of sinking particulate organic matter in the water column comes from material collected in sediment traps.
  • Marine snow is an aggregate of detritus, living organisms and some inorganic matter.


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