Chapter 21

Question 0

Pesticides

Answer 0

Products used on crops to control insects and other pests

Question 1

Pollution

Answer 1

Any dirty or harmful substance in the environment

Question 2

Acid rain

Answer 2

Rain that is far more acidic then normal

Question 3

Smog

Answer 3

A yellow-brown haze that forms when sunlight reacts with air pollution

Question 4

Ozone layer

Answer 4

A shield that protects living things from ultraviolet radiation

Question 5

Greenhouse effect

Answer 5

The trapping of heat by carbon dioxide and other gases in the air

Question 6

Global warming

Answer 6

A rise in the earths temperatures

Question 7

Landfills

Answer 7

Huge pits where wastes are dumped and buried

Question 8

Hazardous wastes

Answer 8

Human-made liquid or solid wastes that may endanger human health or the environment

Question 9

Environmental protection agency (EPA)

Answer 9

The governmental agency that is committed to protecting the environment

Question 10

Biodegradable

Answer 10

Broken down easily in the environment

Question 11

Non-renewable resources

Answer 11

Substances that cannot be replaced once they are used

Question 12

Conservation

Answer 12

The saving of resources

Question 13

Precycling

Answer 13

Reducing waste before it occurs