Estuaries Quiz Review

Which best explains why estuaries are an important habitat for many marine organisms in comparison to the open ocean?

• There is less food in estuaries.

• There are more predators in estuaries.

• There is more salt available in estuaries.

• There are more nutrients available in estuaries.

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Which best explains why inhabitants of an estuary must adapt to frequent environmental changes?

• Estuaries receive little sunlight.

• The water temperature is constantly warm.

• The salinity of the water is constantly changing.

• Low levels of oxygen are absorbed by the water.

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Which describes an estuary?

• A large body of freshwater.

• A large body of salt water.

• The wide, lower course of a river where fresh and saltwater mix.

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Which best describes the water found in estuaries?

• brackish

• salt water

• freshwater

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When would you expect the concentration of salt in the estuary water to be LOWEST near the mouth of the river?

• when the river flow is low and the tide is low

• when the river flow is high and the tide is low

• when the river flow is low and the tide is high

• when the river flow is high and the tide is high

Which best explains the effects of a hurricane on estuary circulation and salinity?

• Salinity levels remain the same as before the hurricane.

• Salinity concentrations stay stable for a week after a hurricane.

• Surface salinity drops within a few hours of a hurricane passing.

• Salinity quickly increases during a hurricane and then sharply decreases.

Which best describes the water distribution in an estuary?

• The saltwater is closer to the surface than the freshwater.

• The freshwater is closer to the surface than the saltwater.

• The saltwater is found closer to the bank, and the freshwater is found closer to the center.

• The freshwater is found closer to the bank, and the saltwater is found closer to the center.

How does overharvesting of oysters impact the water quality of an estuary?

• increase in pollution usually consumed by oysters

• decrease in CO2 levels due to increase in pollution

• increase in organic matter usually filtered by oysters

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Which best describes the types of organisms found in estuaries?

• They can survive in salt water.

• They cannot tolerate brackish water

• They are only found in freshwater.

• They tolerate both freshwater and saltwater.

Which best explains the importance of estuaries?

• Estuaries are freshwater areas that support a large amount of living things.

• Estuaries are areas where freshwater and saltwater collide, resulting in a large amount of biodiversity.

• Estuaries are tropical areas that support an abundance of life found usually in cold regions of the ocean.

• Estuaries are nutrient rich areas because they have large amounts of carbon dioxide seeping into the water from the ground below.

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