Front

A suspension of small particles in a gas; the particles may be solid or liquid or a mixture of both.

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AEROSOLS

Front

Waste material such as garbage, refuse, rubbish, and trash.

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WASTE

Front

A machine that converts energy into mechanical force or motion.

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ENGINES

Front

The act or process of polluting or the state of being polluted, especially the contamination of soil, water, or the atmosphere by the discharge of harmful substances.

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POLLUTION

Front

Region of the stratosphere containing relatively high concentrations of ozone.

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OZONE LAYER