Human Impact on Oceans

The diagram shows the relationship between some of the organisms in a marine food web. Which of the following is MOST LIKELY to happen if a large number of phytoplankton are killed from runoff entering the ocean?

• The number of zooplankton would probably increase because they wouldn't have to compete with phytoplankton for food.

• The number of salmon would probably decrease because there would be less food available for zooplankton and herring.

• The number of porpoises would probably stay the same because porpoises are far removed from phytoplankton in the food web.

• The Sun would probably not emit as much energy because there would not be as many phytoplankton in the ocean.

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This graph shows the sources of nitrogen entering the Gulf of Mexico as pollution. What is one conclusion you can make based on the information in the graph?

• Nitrogen is not a problem.

• Corn and soybeans are the only crops associated with nitrogen pollution.

• Most nitrogen pollution found in the Gulf of Mexico comes from farming crops.

• Nitrogen that comes from the atmosphere is more harmful than nitrogen from crops.

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What organisms are the basis of a marine food web?

• Crabs

• Fish

• Phytoplankton

• Zooplankton

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The largest source of pollution in the ocean comes from

• acid rain

• oil spills

• runoff

• wind

What is one way humans are trying to positively impact the ocean?

• Fishing

• Creating artificial reefs

• Harvesting oil and natural gas

• Transporting goods in ocean vessels

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Which of the following is NOT a source of pollution in the ocean?

• Nitrogen and phosphorus from fertilizers used on land.

• Oils found on city streets.

• Sand drifting along the bottom of the ocean floor.

• Emissions from gas-burning vehicles.

Which of the following is associated with dead zones in the ocean?

• A decrease in nitrogen levels.

• An increase in oxygen levels.

• An increase in the number of fish.

• Runoff from fertilizers.

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How do human activities such as overfishing impact ocean systems?

• They increase the biodiversity of marine life.

• They can lead to the depletion of fish populations.

• They have no significant impact on ocean systems.

• They help in the natural regeneration of coral reefs.

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Which of the following is a way humans depend on ocean systems?

• For mining coal.

• For fresh drinking water.

• For transportation and trade.

• For growing wheat.

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What is one effect of oil spills on ocean systems?

• They fertilize the ocean floor.

• They create new habitats for marine life.

• They can harm marine animals and plants.

• They have no effect on ocean systems.

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