The substances that cause water pollution are called ___________.

• Pollen.
• Populations.
• Pollutants.
• Precipitation.

___________ is a specific source of pollution that can be identified.

• Point source pollution.
• Nonpoint source pollution.
• Greenhouse gas.
• Oil spill.

Nonpoint sources of toxic chemicals that pollute water include:

• Atmospheric deposition.
• Runoff from farms.
• Storm drains.
• All of these.

Sanitary landfills are designed for disposal of:

• Hospital wastes (infectious).
• Household garbage.
• Industrial wastes.
• Radioactive wastes.

You are most assured of a safe supply of drinking water when you visit:

• Asia.
• Africa.
• North America.
• India.

These are chemicals intended to kill insects and other organisms that damage crops.

• Spermicides.
• Pesticides.
• Genocides.
• Fertilizers.

Using the pesticides like DDT may cause:

• Healthier teeth.
• Eutrophication.
• Bird's egg shells to be thinner.
• No effects on the environment.

Which is not a major source of water pollution?

• Human waste.
• Industrial waste.
• Chemical runoff.
• Melting of ice caps.

Each year thousands of children die from diarrhea caused by drinking contaminated water.

• True.
• False.

In an emergency, you will boil water for at least one minute to ensure that it does not have any organisms that will cause disease.

• True.
• False.