The toxic chemicals are the substance that can be poisonous or cause the health effects , They don’t break down easily in the environment , they can build up the tissues of small organisms , they can move up through the food chain .
The chemicals can be toxic because they can harm us when they enter or contact the body , they can threaten the human health , The motor vehicle emissions of nitrogen and sulphur oxides cause the acid rain which poisons the fish and other aquatic organisms in the rivers and lakes .
carbon dioxide gas causes the greenhouse effect and the climate change , Chlorofluorocarbons ( CFCs ) cause the destruction of ozone in the stratosphere and they create the possibility of serious environmental damage from ultraviolet radiation .
The oil drilling and transport , mining and maritime operations all result in the accidental introduction of toxic materials into the marine environment , and the leakage from the storage tanks and the pipelines , and the seepage from the waste dumps .
The toxic materials or substances can poison people and other life, They can cause illness and even death if swallowed or absorbed through the skin , where the pesticides , the weed killers , and many household cleaners are toxic , they occurs as a result of a variety of human activities .
The industries and the sewage treatment plants discharge the wastes which contain the toxic substances directly into the waterways , These direct pipeline discharges are called the point sources .
Kathie Boyle from the Human Performance Center talks about the benefits of aquatic exercise.
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