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Experiment I - Water Purification Through Water Cycle

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Mix the dirt (or sand) and water in a large bowl. Stand a clean and empty short glass in the center of the bowl. Place the bowl outside in the sun. Cover the bowl with the plastic wrap and weigh down the edges with the remaining rocks. Place one rock on the plastic wrap directly over the cup. Allow the bowl to remain in the sun for several hours. Look in the cup (it should contain some relatively clean water free of mud). Look in the bowl (it should contain the dried dirt).


1. What are the two processes responsible for purifying the water? (Evaporation and Condensation)

2. Where else do you see condensation? (Cold drink outside on a hot day)

3. How does this process work on Earth?

4. What is the plastic wrap? (Our atmosphere)

5. What is the condensation? (Clouds and rain)

6. What would happen if the plastic wrap was dirty? (Air pollution)

VARIATIONS: Add food coloring to water to demonstrate that this process does not remove all pollutants. This may be done simultaneously with the procedure above.

Source: Environmental Protection Agency

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Related Articles:

EXPERIMENT II- Non-Point Source Pollution
EXPERIMENT III - Role of Plants in Water Filtration


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