Hydrosphere - Practice Test 3

Attempt the quiz above first, then review every question with its correct answer and a short explanation below.

1. Q1.The Oyashio Current is a:

   • A.Cold current in North Pacific✓ Correct Answer
   • B.Warm current in North Pacific
   • C.Cold current in Atlantic
   • D.Warm current in Indian

   Explanation: It brings cold water down from the Bering Sea.

2. Q2.Tides are highest during:

   • A.Syzygy (Sun-Moon-Earth alignment)✓ Correct Answer
   • B.Quadrature
   • C.Winter
   • D.Summer

   Explanation: Combined gravity results in Spring Tides.

3. Q3.The Great Barrier Reef is formed by:

   • A.Coral Polyps✓ Correct Answer
   • B.Volcanoes
   • C.Sand deposits
   • D.Tectonic plates

   Explanation: Tiny marine invertebrates.

4. Q4.Coral Bleaching is caused by:

   • A.Global Warming / High Temp✓ Correct Answer
   • B.Cooling of water
   • C.Low salinity
   • D.Fish

   Explanation: Stress (heat) causes corals to expel algae (zooxanthellae).

5. Q5.Which ocean has the longest coastline?

   • A.Atlantic Ocean✓ Correct Answer
   • B.Pacific Ocean
   • C.Indian Ocean
   • D.Arctic Ocean

   Explanation: Due to its indented coastlines.

6. Q6.The cold current flowing along the coast of California is:

   • A.California Current✓ Correct Answer
   • B.Alaska Current
   • C.Florida Current
   • D.Peru Current

   Explanation: It brings cold water southwards.

7. Q7.The Mid-Atlantic Ridge is a result of:

   • A.Sea Floor Spreading✓ Correct Answer
   • B.Subduction
   • C.Folding
   • D.Erosion

   Explanation: Divergent plate boundary creating new floor.

8. Q8.Which current warms the coast of Japan?

   • A.Kuroshio✓ Correct Answer
   • B.Oyashio
   • C.California
   • D.Canary

   Explanation: Black Current or Japan Current.

9. Q9.The Grand Banks near Newfoundland is famous for:

   • A.Fishing grounds✓ Correct Answer
   • B.Oil rigs
   • C.Coral reefs
   • D.Tsunamis

   Explanation: Meeting of Gulf Stream and Labrador Current creates rich plankton.

10. Q10.Which Strait connects the Pacific and Arctic Oceans?

    • A.Bering Strait✓ Correct Answer
    • B.Dover Strait
    • C.Malacca Strait
    • D.Magellan Strait

    Explanation: Between Russia and Alaska.

11. Q11.The salinity of the Dead Sea allows humans to:

    • A.Float easily✓ Correct Answer
    • B.Sink fast
    • C.Drink water
    • D.Walk on water

    Explanation: High density provides high buoyancy.

12. Q12.Dogger Bank is a famous fishing ground in:

    • A.North Sea✓ Correct Answer
    • B.Pacific Ocean
    • C.Indian Ocean
    • D.Baltic Sea

    Explanation: Located in the North Sea (Europe).

13. Q13.Which ocean is the busiest for trade?

    • A.North Atlantic✓ Correct Answer
    • B.South Atlantic
    • C.Pacific
    • D.Indian

    Explanation: Connects industrialized Europe and North America.

14. Q14.The Strait of Malacca connects:

    • A.Andaman Sea and South China Sea✓ Correct Answer
    • B.Java Sea and Celebes Sea
    • C.Indian and Atlantic
    • D.Red Sea and Med

    Explanation: Vital shipping lane.

15. Q15.Which ocean current flows along the east coast of USA?

    • A.Gulf Stream✓ Correct Answer
    • B.California Current
    • C.Canary Current
    • D.Peru Current

    Explanation: Warm Gulf Stream.

16. Q16.The movement of water from ocean to atmosphere and back is:

    • A.Hydrological Cycle✓ Correct Answer
    • B.Rock Cycle
    • C.Nitrogen Cycle
    • D.Carbon Cycle

    Explanation: Evaporation -> Condensation -> Precipitation.

17. Q17.Ocean water freezing point is:

    • A.Lower than freshwater (< 0°C)✓ Correct Answer
    • B.Higher than freshwater
    • C.0°C
    • D.10°C

    Explanation: Salt lowers the freezing point (~ -1.9°C).

18. Q18.Which of these is a marginal sea of the Arctic Ocean?

    • A.Kara Sea✓ Correct Answer
    • B.Red Sea
    • C.Arabian Sea
    • D.Tasman Sea

    Explanation: Located north of Russia.

19. Q19.The Brazil Current is a:

    • A.Warm Current✓ Correct Answer
    • B.Cold Current
    • C.Neutral Current
    • D.Wind

    Explanation: Flows south along Brazil coast.

20. Q20.The Falkland Current is a:

    • A.Cold Current✓ Correct Answer
    • B.Warm Current
    • C.River
    • D.Lake

    Explanation: Flows north along Argentina coast.