foliage along road

foliage along road

dirt road, leaves

Cooler temperatures signal deciduous trees to stop producing chlorophyll, the green pigment responsible for photosynthesis, and the chlorophyll breaks down and disappears, unmasking other leaf pigments. These other pigments -- called xanthophylls and carotenes -- are what create the yellows and oranges seen in the leaves.

Image: Jeff Mulhollem
Licensing and Use