Ocean Dynamics Quiz

What divides the world ocean into separate basins?

• Tidal waves

• Continental shelves

• Ocean currents

• Great land masses and continents

What happens to a tidal wave when it enters a funnel-shaped estuary?

• It decreases in height

• It forms a wall of water called a bore

• It stops moving

• It becomes a whirlpool

How do tides help in keeping river channels and harbors free from sediment?

• By reducing water salinity

• By carrying away silt

• By increasing water temperature

• By stopping water flow

What was the world's first tidal power plant built?

• In India

• In China

• In France

• In the United States

How do tides prevent ports from becoming icebound in winter?

• By increasing water salinity

• By bringing in salt water and keeping the sea in motion

• By raising water temperature

• By reducing water levels

What is the average salt content of seawater expressed as?

• 20 per thousand

• 50 per thousand

• 10 per thousand

• 35 per thousand

Which body of water has the highest salinity?

• The Mediterranean Sea

• The Arctic Ocean

• The Caspian Sea

• The Dead Sea

What factors affect the salinity of the sea?

• Rate of evaporation and amount of fresh water added

• Wind speed and direction

• Temperature and pressure

• Ocean currents and tides

What is the temperature range of ocean water in the tropical zone?

• 0°C to 10°C

• 15°C to 20°C

• 30°C to 35°C

• 23°C to 27°C

How does the temperature of ocean water change with depth?

• It fluctuates randomly

• It decreases with depth

• It increases with depth

• It remains constant