вторник, 7 мая 2013 г.

THE TYPES OF QUESTIONS
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Pollution 

                              Pollution is the introduction of contaminants into the natural environment that cause adverse change. Pollution can take the form of chemical substances or energy, such as noise, heat or light. Pollutants, the components of pollution, can be either foreign substances/energies or naturally occurring contaminants. Pollution is often classed as point source or nonpoint source pollution.

The major forms of pollution are listed below along with the particular contaminant relevant to each of them:

LOOK THE VIDEO AND SAY WHAT ARE THE CAUSES OF POLLUTION? DISCUSS THE VIDEO: