Ocean Review

Where does most of the dissolved Oxygen in the ocean come from?

• Decaying life in the ocean.

• Plants and phytoplankton doing photosynthesis.

• Underwater earthquakes.

• Animals that live in the ocean.

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Which of the following helps provide energy to organisms that live in the deep ocean?

• Cold water temps.

• Hydrothermal vents.

• Few predators.

• High water pressure

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Why is there more fishing in areas of upwelling?

• Deep currents carry nutrients to the surface and critters prosper.

• Deep currents carry nutrients to the bottom and critters prosper.

• Upwelling keeps predator fish away from the ones we want.

• Deep currents drag fish to the surface we want to catch.

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Most critically important gases in the ocean?

• nitrogen & oxygen

• oxygen & methane

• oxygen & carbon dioxide

• nitrogen & sulfide

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Hydrothermal vents give off methane and heat that deep ocean critters use to make energy. What's this?

• Chemosynthesis

• Photosynthesis

• Hydropower

• Thermal Heat

What is the main challenge of deep sea exploration?

• Cost

• Pressure

• Time

• People

Which resources do we get from the ocean?

• Minerals and fossil fuels.

• Food.

• Medicine.

• All of the above.

Why are estuaries (where rivers meet the ocean) significant? Choose all that apply.

• Land protection from ocean surges.

• Nurseries for marine young.

• Commercial fishing

• Human recreation

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Where do most marine organisms live?

• Photic/Neritic zone at the surface where sunlight & nutrients are.

• Abyssal/Benthic zone at the bottom where lots of nutrients are.

• In the Oceanic/aphotic zone where there are fewer predators.

• Estuary or intertidal zones where they have more protection.

Which organism is the base of most marine food webs? Check all that apply.

• Phytoplankton

• Algae

• Zooplankton

• Small fish

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