The reason why leaves change color is because as we get closer to autumn and some parts of the planet get fewer hours of sunlight, trees respond by stopping the food-making photosynthesis process and slowing the production of chlorophyll until, eventually, they stop producing it altogether and the green color of the leaf fades away into the winter. The colors turn different colors because the tempter takes the stuff that makes it brake and it falls to the ground.
I give thanks to :
http://mentalfloss.com/article/31501/how-why-do-leaves-change-color#ixzz29DmqDxWZ
http://mentalfloss.com/article/31501/how-why-do-leaves-change-color#ixzz29DmqDxWZ