Ocean Knowledge Treasure

General Knowledge · 10 questions

From currents to the deep seafloor, put your ocean knowledge to the test against your friends.

Answer each question first, then check with “Show the answer”. You can also play the same quiz in the Quizera app by searching for it in Explore, as a live game, a test or flashcards.

1. Approximately what percentage of Earth’s surface is covered by oceans?

   1. 71%
   2. 61%
   3. 81%
   4. 51%
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   A) 71%

2. What is the coastal area where a river’s fresh water mixes with seawater called?

   1. Fjord
   2. Lagoon
   3. Estuary
   4. Atoll
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   C) Estuary

3. Which current carries warm water northeastward along the eastern coast of North America?

   1. Canary Current
   2. Gulf Stream
   3. Benguela Current
   4. Kuroshio Current
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   B) Gulf Stream

4. In what kind of environment do coral reefs generally develop?

   1. Deep, dark polar waters
   2. Freshwater lakes
   3. Shallow, sunlit tropical waters
   4. Cold, turbid coastal waters
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   C) Shallow, sunlit tropical waters

5. What is the ocean process that brings nutrients from depth toward the surface?

   1. Tides
   2. Upwelling
   3. Wave breaking
   4. Downwelling
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   B) Upwelling

6. As new seafloor forms at mid-ocean ridges, how are the plates moving?

   1. Away from each other
   2. In rotation
   3. Toward each other
   4. Sideways past each other
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   A) Away from each other

7. What commonly smooths the surface of broad, flat areas on the deep ocean floor?

   1. Fine sediment
   2. Lava flows
   3. Coral formations
   4. Coarse rock piles
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   A) Fine sediment

8. What mainly forms the dark clouds released by black smokers?

   1. Ice crystals
   2. Air bubbles
   3. Mineral particles
   4. Organic fibers
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   C) Mineral particles

9. In global ocean circulation, which two properties mainly determine the density of deep water masses?

   1. Coastline shape and wind direction
   2. Tidal range and depth
   3. Wavelength and light
   4. Temperature and salinity
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   D) Temperature and salinity

10. At the Mariana Trench, which plate descends beneath the Philippine Sea Plate?

    1. Cocos Plate
    2. Nazca Plate
    3. Australian Plate
    4. Pacific Plate
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    D) Pacific Plate