waste, Old things that are not useful anymore and are given away., pollution, Dirty stuff in the air or water that is bad., stream, A small, narrow river., Sustainability, Using things carefully so they last for the future., rubbish, Solid things people throw away because they do not want them., factory, A big building where people make things like clothes or cars., chemicals, Special, often powerful, liquids and solids that can be good or bad., contaminate, To put bad, dangerous things into water or food.

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