POLUTION

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.

Back

WASTE

Front

A machine that converts energy into mechanical force or motion.

Back

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.

Back

POLLUTION

Front

Region of the stratosphere containing relatively high concentrations of ozone.

Back

OZONE LAYER