Under the Sea

Science and Technology · 10 questions

The largest and least known world on the planet.

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1. What is the ocean zone sunlight never reaches called?

   1. The continental shelf
   2. The thermocline
   3. The intertidal zone
   4. The aphotic zone
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   D) The aphotic zone

2. What is it called when deep sea creatures produce their own light?

   1. Phosphorescence
   2. Bioluminescence
   3. Photosynthesis
   4. Fluorescence
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   B) Bioluminescence

3. Which physical factor rises steeply with depth?

   1. Pressure
   2. Salinity
   3. Light
   4. Current speed
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   A) Pressure

4. What supports life around deep sea hydrothermal vents?

   1. Sunlight from above
   2. Debris falling from the surface
   3. Chemical energy
   4. Volcanic ash
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   C) Chemical energy

5. Why do colours fade towards blue as you descend?

   1. Water itself is blue
   2. The sky reflects into the water
   3. Salt bends the light
   4. Red wavelengths are absorbed first
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   D) Red wavelengths are absorbed first

6. What does coral bleaching actually mean?

   1. New coral is forming
   2. The water has become too salty
   3. The algae living in the coral are expelled
   4. The coral is ageing naturally
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   C) The algae living in the coral are expelled

7. What is the main role of ocean currents in global climate?

   1. Blocking rainfall entirely
   2. Moving heat between latitudes
   3. Equalising salt levels
   4. Creating the tides
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   B) Moving heat between latitudes

8. Less of the ocean floor has been mapped in detail than the surface of Mars.

   1. True
   2. False
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   A) True

9. Seawater has the same salinity everywhere on Earth.

   1. True
   2. False
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   B) False

10. The oceans absorb a significant share of atmospheric carbon dioxide.

    1. True
    2. False
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    A) True