Understanding Earth's Oceans

What fraction of Earth's surface is covered by water?

• 1/3

• 3/4

• 1/2

• 2/3

Which ocean is the largest in the world?

• Atlantic Ocean

• Indian Ocean

• Pacific Ocean

• Arctic Ocean

What is the primary cause of ocean waves?

• Wind friction

• Gravitational pull

• Earth's rotation

• Tidal forces

In which direction do ocean currents in the northern hemisphere generally travel?

• Clockwise

• North to South

• Counterclockwise

• East to West

What type of ocean current is the Gulf Stream?

• Polar current

• Neutral current

• Warm current

• Cold current

What natural phenomenon is created when warm and cold currents mix?

• Hurricanes

• Foggy conditions

• Tsunamis

• Earthquakes

What causes tides on Earth?

• Earth's rotation

• Wind patterns

• Ocean currents

• Gravitational pull of the Sun and Moon

What is a spring tide?

• A tide caused by wind

• A tide occurring in spring

• A tide with maximum difference

• A tide with minimal difference

What is a tsunami?

• A large ocean wave caused by wind

• A wave caused by ocean currents

• A massive tidal wave caused by underwater disturbances

• A small wave caused by tides

How fast can a tsunami travel?

• 100 kmph

• 700 kmph

• 300 kmph

• 500 kmph