Lesson 6.2 Review

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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How does plastic effect sea life?

• Microplastics create dead zones in the oceans

• Wildlife such as dolphins, seals and seabirds often eat plastic, mistaking it for food

• Plastics provide habitats for marine life

• None of the above

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Pollution can cause harm to the ________.

• air

• water

• land

• air, water and land

Human impact on the environment is often more dramatic than the impact of most other living things because humans have a greater

• need for water.

• ability to alter the environment.

• need for food.

• ability to adapt to change.

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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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How does plastic pollution affect ocean systems?

• It decomposes quickly and enriches the water.

• It provides food for marine animals.

• It can entangle and harm marine life.

• It has no impact on ocean systems.

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