why do leaves change color in the fall?

Answer 1

first of all I should tell you that I dunno the right spelling as I am not a native speaker!but in fall the chlorophyl in the leaves will be destroyed but other cartonoeds don`t,and because the others colors are red,orange and yellow so the leaf will look red,orange,yellow or some color between them.

Answer 2

The tree reveses its sap flow back to the core to survive the winter therefore chlorophyl is lost and the leaves turn brown and die off