This site is from Franklin Institute Science Museum. It's the home page to an entire unit on wind and what it can do. Other places to go are school sites that share their investigations and experiences. Don't miss these. They can give you useful ideas.
Every link provides activities, book suggestions, and weblinks for more learning.
Each one uses kids photos and great art to motivate. Meet a very interesting inventor and his wind machines. Includes ways for children to try some of his ideas. Directions and science information to explain why and how the copter works. Water NWF for Kids, Water Cycle Directions to make your own water cycle with great definitions for vocabulary.