Read the passage and answer the questions.

Environmental pollution is a term that refers to all the ways by which man pollutes his surroundings. Man dirties the air with exhaust gases and smoke, poisons the water with chemicals and other substances, and damages the soil with too many fertilizers and pesticides. Man also pollutes his surroundings in various other ways. For example, people ruin natural beauty by scattering junk and litter on the land and in the water.        Environmental pollution is one of the most serious problems facing mankind today. Air, water and soil are necessary to the survival of all living things. Badly polluted air can cause illness, and even death. Polluted water kills fish and other marine life. Pollution of soil reduces the amount of land that is available for growing food. Environmental pollution also brings ugliness to man’s natural beautiful world. 

What does man poison the water with?