Ocean Currents and Tides

What is the movement of water in one direction called?

• Current

• Tide

• Circulation

• Conveyor belt

Which type of current is caused by wind blowing onto the ocean surface?

• Thermohaline circulation

• Waves

• Wind-driven currents

• Tides

How deep can wind-driven currents reach?

• 100 meters

• 200 meters

• 500 meters

• 5000 meters

What are the two main types of permanent circulating currents?

• Wind-driven currents and tides

• Thermohaline circulation and waves

• Waves and gyres

• Wind-driven currents and thermohaline circulation

What causes thermohaline circulation?

• Differences in water temperature and salinity

• Gravitational pull of the Moon

• Wind blowing onto the ocean surface

• Alternating rising and falling of the sea

Why is thermohaline circulation known as the 'great ocean conveyor belt'?

• It moves water all around the world

• It creates high and low tides

• It circulates water in large circular patterns

• It balances the temperature of the Earth

How long does it take for water to make one complete circuit of the planet through thermohaline circulation?

• 10 years

• 100 years

• 1000 years

• 10,000 years

What is the alternate rising and falling of the sea called?

• Current

• Circulation

• Tide

• Conveyor belt

What causes tides?

• Wind blowing onto the ocean surface

• Differences in water temperature and salinity

• Gravitational pull of the Moon

• Alternating rising and falling of the sea

How many high tides and low tides occur in 24 hrs?

• 1 high tide, 1 low tide

• 2 high tides, 2 low tides

• 3 high tides, 3 low tides

• 4 high tides, 4 low tides