4th Grade Science: Chapter 2, Lesson 4

What does the word emission mean?

• the removal of pollutants
• the release of something into the environment
• the conservation of resources

What is greenhouse gas?

• A gas that cools the atmosphere
• A gas that makes the atmosphere able to hold more heat
• A gas that purifies the air

What is the definition of a pollutant?

• A beneficial substance released into the environment
• A gas that makes the atmosphere able to hold more heat
• A harmful substance released into the environment

What is a scrubber?

• An item used in the bathroom to clean up messes
• A device in a power plant that reduces the amount of released pollutants sent into the air
• A machine that generates more greenhouse gases

When do impacts on the environment occur?

• They typically occur during the winter months
• They occur when humans change the land, remove a resource, or during energy production
• They occur when building are constructed and others buildings are torn down

How can emissions impact the environment?

• They have no impact
• They can poison land, water, and air
• They can provide healthy crops and land for farmers

Impacts of Energy Production: Environmental impacts depend on how the power is generated, what plants are emitted, and methods used to reduce harmful effects

• True
• False

What is released when burning fossil fuels?

• Water
• Ash and harmful chemicals
• Fresh air

What happens when some chemicals cause rain to become acidic?

• It has no impact on water bodies
• It increases the ability of streams and lakes to support organisms
• It reduces the ability of streams and lakes to support organisms

What do power plants use scrubbers for?

• To increase pollution
• To generate more electrical energy
• To reduce or prevent pollution