5th Gr Science Unit 2 Lesson 6 Quiz

What are estuaries?

• Places where freshwater rivers and streams flow into the ocean, mixing with the seawater.

• Places where saltwater rivers and streams flow into the ocean, mixing with the freshwater.

• Places where freshwater rivers and streams flow into the lakes, mixing with the seawater.

• Places where freshwater rivers and streams flow into the ocean, mixing with the groundwater.

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How can nutrients enter estuaries?

• From polluted air from power plants and cars

• From septic systems

• From industrial waste

• From ocean currents

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What can too many nutrients in estuaries lead to?

• Decreased algae growth

• Increased fish population

• Algae blooms

• Improved plant life

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What is one of the challenges facing estuaries?

• Pollution

• Overfishing

• Habitat destruction

• Too many nutrients

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What can algae blooms do to the water ecosystem?

• Provide valuable oxygen to the water ecosystem

• Have no effect on the water ecosystem

• Use up valuable oxygen from the water, further harming the ecosystem

• Increase the number of nutrients in the water, benefiting the ecosystem

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What is the negative impact of excessive algae growth on estuaries?

• Decreased oxygen levels

• Increased biodiversity

• Improved water quality

• Enhanced ecosystem stability

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