Water Cycle - Magic School Bus. We watched this one today, and it really connected some dots for Nugget. If you enjoy the show, buy the boxed set on DVD. One of our best resources for fun leaping-off points for learning.
3 of my favorite water cycle, rain cycle experiments. These science experiments are simple to set up and use common household items. http://lessons4littleones.com/2015/04/15/water-cycle-rain-cycle-science-experiments/