water  - What do we drink every day to stay healthy?, contamination - What happens when water gets dirty and unsafe?, strange - How do we say something looks or feels not normal?, do not litter - What should we remember to keep streets and rivers clean?, protect the environment - What do we do to take care of nature?, Wastewater - What do we call dirty water from homes?, Industrial waste - What trash comes from factories?, Purification - What do we do to make dirty water clean again?, Safe drinking water - What water can we drink without getting sick?, Hazardous substances - What things can be dangerous for people and animals?,

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