Our Planet High Seas

What is the primary reason that the seas in higher latitudes are more productive than those in the tropics?

• They have warmer waters.

• They have longer summer days and nutrient-rich waters.

• They are closer to the equator.

• They have more marine life.

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NGSS.MS-ESS2-6

What very tall ocean plant is this?

Answer explanation

Kelp can grow over 150 feet tall! It is like an underwater forest where many marine species make their homes.

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NGSS.MS-LS2-3

True or False: Sharks, and other apex predators, are important creatures for maintaining balance in marine ecosystems

• True

• False

Answer explanation

True! Sharks help to maintain balance, but humans have severely threatened shark livelihoods, pushing many species closer and closer to extinction.

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What is the primary factor that drives ocean currents in the high seas?

• Wind patterns

• Salinity gradients

• Tidal forces

• Earth's rotation

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NGSS.MS-ESS2-6

Which of the following is a major threat to biodiversity in the high seas?

• Overfishing

• Increased salinity

• Decreased sunlight

• Stable temperatures

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NGSS.MS-ESS3-4

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True or False: The high seas are areas of the ocean that are beyond national jurisdiction.

• True

• False

What is the main source of energy for marine life in the high seas?

• Solar energy

• Geothermal energy

• Chemical energy

• Nuclear energy

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NGSS.MS-LS1-6

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Which of the following organisms is considered a primary producer in the high seas?

• Phytoplankton

• Zooplankton

• Fish

• Sharks

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NGSS.MS-LS2-3

What role do ocean gyres play in the high seas?

• They help distribute heat and nutrients

• They increase salinity

• They decrease water temperature

• They create tidal waves

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NGSS.MS-ESS2-6

Which scientific instrument is commonly used to measure the salinity of seawater?

• Thermometer

• Barometer

• Refractometer

• Anemometer