Chapter 20 Flashcards
1
Q
What is air pollution?
A
The condition in which air contains a high concentration of chemicals that may harm living things or damage non-living things.
2
Q
How does acid rain come about?
A
Acid rain is formed when acidic air pollutants such as sulfur dioxide and nitrogen dioxide react with water in the atmosphere.
3
Q
What are chlorofluorocarbons (CFCs)?
A
Compounds containing the elements carbon, fluorine and chlorine.
4
Q
What is the carbon cycle?
A
The mechanism maintaining the level of carbon dioxide in the atmosphere.
5
Q
What is global warming?
A
The increases in the Earth’s average temperature due to the build-up of greenhouse gases in the atmosphere.
