Health 21

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14 Terms

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Pollution

Any dirty or harmful substance in the environment.

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Pesticides

Products used on crops to control insects and other pests.

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Acid Rain

Rain that is far more acidic than normal.

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Smog

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

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Ozone Layer

A shield that protects living things from ultraviolet (UV) radiation.

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Greenhouse Effect

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

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Global Warming

A rise in the earth’s temperatures.

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Landfills

Huge pits where wastes are dumped and buried.

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Hazardous Wastes

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

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Environmental Protection Agency (EPA)

The governmental agency that is committed to protecting the environment.

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Biodegradable

Broken down easily in the environment.

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Nonrenewable Resources

Substances that cannot be replaced once they are used.

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Conservation

The saving of resources.

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Precycling

Reducing waste before it occurs.