Answers:
You can help yourself with this homework by plugging 'chemical pollution' into your search engine and then reading through the tons of information you will receive. It will cover the cause and the effect and give many, many examples.
do a minimal amount of research and that should work well for you. Seriously, just google it-lazy.
Trains carry lots of chemicals. Trains derailments and spills are good sources of possible chemical pollution.
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