Ocean Currents

What percentage of the ocean is made up of surface currents?

• 5%

• 10%

• 50%

• 90%

What primarily causes surface currents in the ocean?

• Earth's rotation

• Salinity differences

• Wind blowing over the water

• Temperature differences

Which of the following is true about density currents?

• They are formed by wind patterns.

• They make up 10% of the ocean.

• They are influenced by temperature and salinity.

• They are always warm currents.

What is the process called when cold, deep water rises and brings nutrients from the ocean floor?

• Downwelling

• Upwelling

• Convection

• Evaporation

Which famous density current is known for creating violent weather like hurricanes in the Atlantic Ocean?

• The California Current

• The Gulf Stream

• The Kuroshio Current

• The Antarctic Circumpolar Current

What is the Coriolis effect?

• The effect of gravity on ocean currents

• The effect of wind on ocean currents

• The apparent curving of moving objects due to Earth's rotation

• The effect of temperature on ocean currents

In which direction do ocean currents in the Northern Hemisphere primarily travel?

• Counterclockwise

• Clockwise

• North to South

• East to West

What is a gyre?

• A type of fish found in the ocean

• A large circular pattern of rotating ocean water

• A type of wave caused by wind

• A deep ocean trench

What is the Great Pacific Garbage Patch?

• A large coral reef in the Pacific Ocean

• A gyre filled with over 700,000 tons of garbage

• A volcanic island in the Pacific Ocean

• A deep-sea trench in the Pacific Ocean

Which of the following factors does NOT affect the density of ocean water?

• Temperature

• Salinity

• Wind speed

• Pressure