Contains a song about the water cycle to the tune of Pitbull's "Give Me Everything Tonight." A fun way to review the water cycle.
This clip from Bill Nye the Science Guy looks at condensation and how to make a cloud in a glass jug.
A webpage that has a lot of links to water cycle activities. They are good ideas, may be a bit basic, but you can change the activities to a challenging content.
The total amount of water above, on and in Earth is not very much. Since most of this water is not usable, the usable parts must be taken care of.