Bill Nye: Ocean Currents and Their Impact

What is the primary reason ocean water is salty?

• Evaporation leaves salt behind
• Rainwater is salty
• Rivers add salt to the ocean
• Fish produce salt

How do ocean currents affect global climates?

• They cool down the equator
• They distribute heat around the planet
• They make all regions equally warm
• They have no effect on climate

Which factor is NOT a driver of ocean currents?

• Wind
• Salinity
• Temperature
• Moon phases

What is the Gulf Stream?

• A river in Europe
• A warm ocean current
• A type of fish
• A mountain range

Why does salty water sink in the ocean?

• It is denser than fresh water
• It is lighter than fresh water
• It evaporates faster
• It is colder

What happens to water molecules when they are heated?

• They move closer together
• They move faster and farther apart
• They become heavier
• They stop moving

How do ocean currents impact marine ecosystems?

• They provide nutrients and transportation
• They make the water salty
• They prevent fish from migrating
• They reduce oxygen levels

What is a thermohaline current?

• A current driven by wind
• A current driven by temperature and salinity
• A current found only in lakes
• A current that flows in the opposite direction of wind

Why are some lakes, like the Great Salt Lake, salty?

• They have no outlet to the sea
• They are close to the ocean
• They receive salt from rain
• They are man-made

What role does the sun play in ocean currents?

• It cools the ocean
• It heats the water, causing movement
• It creates waves
• It evaporates all the water