Impact on Water

Which will most likely happen if lake water becomes polluted by humans?

• Animals in the lake will die.

• There will. be more fish in the lake.

• The pollution will not hurt the plants or animals in the water.

• It will change the soil around the lake into pebbles.

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Why is it important to clean, conserve and protect water?

• Water is expensive

• Water is a living thing

• Water can be frozen

• Water is a limited resource

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Which is/are the possible effects of excessive nutrients [nitrates and phosphates] carried by agricultural runoff into our bodies of water?

• algal bloom

• sunlight is unable to penetrate to the bottom of the river or lake.

• death of aquatic plants and animals

• all of the above

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What is the advantage of planting trees along a river or lake?

• It will make these surface water fresh.

• Trees will absorb the pollutants in the water.

• The trees will reduce the excessive erosion of sediments, thus protecting the aquatic organisms.

• The trees will make the view attractive to tourists.

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What are the negative effects of building dams?

• It blocks migratory fish that intends to reproduce.

• It causes water to dry downstream.

• It causes high water level downstream.

• It will cause plants to die downstream.

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Water pollution occurs when ________

• Harmful substances enter a water supply

• Industries dispose of waste safely and correctly.

• Industries dispose waste on bodies of water.

• All are correct.

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Three of these are the effects of water pollution.

• Death of animals

• habitat destruction

• humans get sick

• lung damage

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Look at the graph below. What is the main source of ocean pollution?

• dumping trash into the ocean

• airborne pollutants

• runoff from land

• offshore mining

______________________ is a structure that blocks and controls the flow of water.

• potable

• dam

• wastewater

• point source pollution

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What is the primary impact of agricultural runoff on freshwater ecosystems?

• A) Increased biodiversity

• B) Algal blooms

• C) Decreased water temperature

• D) Increased oxygen levels

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