Lesson 15: Water Pollution

What percentage of Earth’s water is undrinkable?

• 80%

• 85%

• 95%

• 97%

Which of the following is a point source of water pollution?

• Pesticides from farms

• Soil runoff from roads

• A factory’s waste pipe dumping chemicals into a river

• Animal waste washing into rivers

What is a non-point source of water pollution?

• A broken sewage pipe leaking into a lake

• Chemicals seeping from a factory

• Fertilizer runoff from multiple farms

• Oil spill from a tanker

Which of the following is an example of thermal pollution?

• Oil spill in the ocean

• Factories releasing warm water into rivers

• Plastic waste floating in lakes

• Farm pesticides washing into streams

Which pollutant is caused by erosion?

• Plastic waste

• Sediment

• Oil and gasoline

• Household detergents

What is one way oil and gasoline pollution can affect water?

• It increases oxygen in the water

• It takes years for the ecosystem to recover

• It improves water quality

• It has no effect on marine life

Which household pollutant is washed down sinks, showers, and toilets?

• Sewage

• Sediment

• Fertilizer

• Oil

What is a major cause of ocean pollution?

• Factory waste dumped directly into lakes

• Road chemicals washing into streams

• Natural occurrences and human activities

• Increased water usage in homes

How can humans help reduce water pollution?

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What makes Earth's fresh water a limited resource?

• It is constantly being created by the ocean

• Most fresh water is either frozen or too salty to drink

• There is more fresh water than saltwater on Earth

• Fresh water sources are increasing every year