My leaves I collected! On the far left is a brown leaf. Next to that is a red leaf,the big one next to that is yellow. The one on the right is orange.The last one on the far right are green. The color changes are caused by pigments.So try to research leaves and pigments!
The search feature above is actually quite good for finding what you need! Type in the one or two words that you are looking for information on, and it will generate a list of every page that mentions that word.