Being able to explain why a leaf changes from green to yellow (or any other color) requires knowledge of how plants capture sunlight (they use the pigment chlorophyll). Since this is the case, why not just teach the whole process? Below is a list of links that I've gathered that explain why leaves change colors in the fall.
- Kidszone - Autumn Leaves - Simplified explanation for younger kids.
- Science Made Simple - Why do Leaves Change Color in the Fall? -
- The Miracle of Fall - A collection of links for teaching about the changing of leaves
- Leaf color change animation - Watch a leaf change from green to yellow from Oct. 1 to Oct. 31
- Foliage Network - The Foliage Network was developed to provide accurate foliage information for various locations across the United States.