pollution

What causes acid rain?

• High concentrations of sulfuric or nitric acid from pollution
• Fertilizer use
• Pesticide use
• CFCs

How much has the ozone layer depleted since the 1970s?

• 3%
• 33%
• 95%
• 12%

When harmful substances build up in the air to unhealthy levels, it is called

• Smog
• Primary pollutant
• Secondary pollutant
• Air pollution

Which of these problems can be caused by air pollution?

• Respiratory problems
• Reduced food sources for humans
• Increased disease for humans
• Decrease in global temperatures

Pollution is__________

• People have contaminated, or dirtied an area with waste
• People have cleaned, or fixed up an area
• People have gathered, or collected the trash in the area 

It is important to conserve nonrenewable resources because....

• may be used up in the future
• are easier to find
• come from remains of plants or animals

I can cut down on pollution by_____

• Walking to the store
• Driving to the store
• Throwing everything away

This type of pollution contaminates lakes, oceans, river, etc. 

• air
• land
• water

Joy cuts down trees to make billions of toothpicks. Joy doesn't use toothpicks, she flosses. What is she destroying?

• land pollution
• conservation
• natural resources

When harmful substances build up in the air to unhealthy levels, it is called

• Smog
• Primary pollutant
• Secondary pollutant
• Air pollution