ESS.8.3 Water Quality

What is water quality?

• The amount of salt in the water

• How clean and safe water is

• The number of fish in a river

• How deep a lake is

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What is potable water?

• Water that is safe to drink

• Water found in the ocean

• Water with high turbidity

• Water with no dissolved oxygen

Which factor directly affects the amount of oxygen in water?

• Turbidity

• Temperature

• pH

• Nitrates

What happens when water has high turbidity?

• The water becomes more acidic

• Sunlight is blocked, harming aquatic plants

• More dissolved oxygen is available

• Fish populations increase

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Why is water quality important for humans?

• It affects drinking water, cooking, and farming

• It makes lakes look prettier

• It keeps rocks from dissolving

• It reduces the need for water conservation

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How do nitrates and phosphates affect aquatic life?

• They help fish grow faster

• They cause eutrophication, reducing oxygen levels

• They make water colder

• They decrease water turbidity

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How can bioindicators help scientists assess water quality?

• They clean polluted water

• Their presence or absence shows water pollution levels

• They measure the pH of water

• They add oxygen to the water

What happens when dissolved oxygen levels drop too low?

• More fish survive

• Fish and other aquatic life can die

• The water becomes clearer

• The pH increases

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How might a factory dumping warm water into a river affect the ecosystem?

• It would increase biodiversity

• It could lower dissolved oxygen and harm fish

• It would help plants grow faster

• It would make the water more acidic

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If a scientist finds only pollution-tolerant organisms in a river, what does that indicate?

• The water is very clean

• The water quality may be poor

• There is no turbidity in the water

• The water has a neutral pH

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