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1. Define petrochemicals : A petrochemical is a chemical which has been derived from petroleum or natural gas. 2. Where they come from : Petrochemicals come from crude oil. 3. What is the refinement process( Fractional distillation ) The refining process starts with fractional distillation,which separates the components of crude oil. 4. How does it get into the environment ? Leaks and spills. 5.What happens once in the environment? It can cause global warming and kill many plants and animals.