8.11C Humans and Oceans Systems

Which ocean activity is NOT related to survival of humans?

• The oceans store solar energy that helps keep Earth warm

• Marine algae produce a large percentage of the world's oxygen and absorb carbon dioxide

• The oceans play an important role in global weather patterns

• Oceans provide drinking water for most of the world's population

How might the information most directly affect the ocean?

• Fish populations increase along the coasts

• Runoff from coastal cities carries more pollutants

• More artificial reefs appear off the coasts

• Shark attacks decrease

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Artificial reefs are manmade structures that provide surfaces for algae and other invertebrates such as barnacles, to attach. In turn, these reefs attract fish and larger predators. Which statement describes a positive effect of artificial reefs on the ocean system?

• These created habitats could increase the local shark population, which might increase the number of shark attacks on humans

• The increased fish population may lead to overfishing on the coasts

• Materials within the artificial reef could contain toxins that damage the marine ecosystem

• There is an increase in biodiversity in the ocean system

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Which is NOT an example of how humans depend on ocean systems?

• Climate regulation

• Source for natural resources

• Excess carbon dioxide production

• Transportation

Humans depend on ecosystems such as the ocean for survival, yet human activities may alter the ocean system. According to research, all of the following are negative impacts of human activity on the ocean system EXCEPT -

• pollution

• oil rigs

• species invasion

• nutrient-rich water

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Many people improperly dispose of motor oil. How could improper disposal of motor oil affect ocean systems?

• The oil evaporates into the atmosphere and pollutes the oceans with acid rain

• The oil becomes runoff pollution and flows into the oceans

• The oil is absorbed by the ocean floor and can be mined again fro commercial use

• The oil soaks into the ground and remains in underground aquifers

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As the population continues to increase, the pressures on water resources also increase. Which is NOT a reason why an increase in human population correlates with extra pressure on aquatic ecosystems?

• Overfishing

• Decreased salinity in oceans

• Increased numbers of vacations on cruise lines

• Loss of habitat for aquatic animals

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Unrestricted coastal development, pollution, and destructive fishing are some of the human activities that deplete ocean marine life. Which human activity is NOT beneficial to conservation of the ocean system?

• Reduction of plastic consumption

• Proper disposal of chemicals

• Release of wastewater

• Artificial reef programs

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How have human activities modified ocean systems?

• Discarded plastics can trap, suffocate, and cause gastrointestinal problems for marine life, resulting in starvation

• Runoff with excessive chemicals can increase nutrients, resulting in more plant growth and reducing the dissolved oxygen content of the water

• Oil from oil spills penetrates the fur and feathers of organisms, causing vulnerability to temperature changes and decreasing buoyancy in water

• All of the answer choices

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The table shows the numbers of fish caught by commercial fishermen near the coast of Texas. Which is the best explanation for the changes in the numbers of fish caught?

• There were fewer fishermen in year 3 than in year 1

• The fish populations are shrinking because of overharvesting

• The fish have adapted and learned to avoid the fishermen's hooks

• The fish have moved to new locations

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