CK-12 Foundation
Ck 12: Life Science: Seasonal Changes in Plants
[Free Registration/Login may be required to access all resource tools.] Have you seen the leaves of plants change colors? During what time of year does this happen? What causes it to happen? Plants can sense changes in the seasons....
Environmental Education for Kids
Eek!: Why Do Leaves Change Color?
Simple, but thorough explanation of fall colors in deciduous forests. Where the color comes from and how trees lose their leaves.