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     • The Water Cycle
     • Water Resources
     • Water Pollution

The Water Cycle

Because the earth is a closed system containing all the water we will ever have, we note that water moves in a continuing pattern known as the water cycle. From evaporation and transpiration to condensation and precipitation, the cycle has continued for millions of years.

Click on the image above and learn more about the water cycle.


You will need:

- 3 l-liter or 2-liter bottles
- String or cord for wicks
- 35 mm film canisters
- Potting soil
- Seeds
- Ice

Begin the experiment:

1. Remove labels from bottles and re-label them A, B, C. Cut bottle A just below the curve at the top so a straight edge remains on the bottle.

2. Cut bottles B and C just around the black bases so bottles have straight sides.

3. Put a hole in one cap on B. Insert a loop of string (about 40 centimeters) so that 5 cm hangs down from the cap.

4. Place a cap with no hole on bottle C. Tie about 20 cm of string around the bottle neck so one end hangs down about 7 cm.

5. Assemble bottles by placing C upside down in B and B upside down in A.

6. Thoroughly wet both string wicks. This will bring water to plant roots. Add about 150 ml of water to A. This is the water source for the cycle. Fill B with enough moist soil to cover the loop of the string.

7. Plant two or three seeds of a fast growing plant in the soil around the perimeter of B. When C isn't in use, leave it off bottle B so that air circulates and seeds can sprout and grow.

8. Place a clear film canister on top of the soil in center of B so that the wick from bottle C hangs into it.

9. Fill bottle C with ice water or fill it with water and then freeze it.

10. Observe over next 2 or 3 days.

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