Water Cycle
If the water Cycle has bodies of water:
Heat energy from the Sun causes water in the ponds to evaporate. This water then becomes Condensation on the top of the Ecosystem. In the "real world" this Condensation would form clouds. Once the top of the Ecosystem (or the clouds) gains enough water that water begins to Precipitate. (the water turns into rain.) This water is then put back into the Ecosystem so the Water Cycle can begin again.
If the water cycle has trees or plants:
The Water Cycle that has trees instead of ponds is pretty much the same as the Water Cycle with ponds except now we have Transpiration. This is where plants lose water through their leaves. Instead of the Sun causing the pond to evaporate, the heat energy from the Sun cause the plant leaves to lose its water. This water then evaporates and forms as condensation on the top of the Ecosystem. Once enough Condensation has formed Precipitation takes place.