Intro to oceans - Hilary online test compilation B

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1. If a sediment's contents is 55% opaline silica, what is the sediment commonly termed

  • Calcareous ooze
  • Pteropod ooze
  • Siliceous Ooze
  • Pelagic Clay
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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. What is the main reason why water sinking in polar regions has a high oxygen concentration?

  • Mainly because the waters in polar regions have a lower salinity than the rest of the ocean
  • Mainly because oxygen is more dense than any other gas, causing the water to sink
  • Mainly because the water is very cold and so the solubility of oxygen is enhanced
  • Mainly because phytoplankton abundance is very high in polar regions and so oxygen is supersaturated due to photosynthesis

4. 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.
  • 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.
  • The concensus between marine scientists is that the oceans are chemically in a steady state

5. Why can phytoplankton not grow below depths of about 100-200 m

  • There is not enough light .
  • There are not enough nutrients
  • The pressure is too great
  • The water is too cold

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