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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.
- 3 1-liter or 2-liter bottles
- String or cord for wicks
- 35 mm film canisters
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- 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.
- Cut bottles B and C just around the black bases so bottles have
straight sides.
- 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.
- 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.
- Assemble bottles by placing C upside down in B and B upside
down in A.
- 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.
- 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.
- Place a clear film canister on top of the soil in center of
B so that the wick from bottle C hangs into it.
- Fill bottle C with ice water or fill it with water and then
freeze it.
- Observe over next 2 to 3 days.
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