How to purify water having access to clean water is vital for people animals and plants water can be contaminated with pathogens chemicals or other impurities that can cause illnesses and health problems. 21st century explorer activity this lesson challenges students to create and test a water filtering system. World vision is the leading provider of clean water in the developing world reaching someone every 30 seconds with clean water join us in saving lives. Wwwnasagov cleaning water educator section 2 10 o packing materials styrofoam popcorn o gray water o italian dressing o tap water or bottled water
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