During a few weeks in the autumn season, tree leaves take on a variety of shades of yellow, orange, red, purple, and brown. The phenomenon is commonly called autumn colors, fall colors or fall foliage. A green leaf is green because of the presence of a pigment known as chlorophyll. As autumn approaches, with daylight hours shortening and temperatures cooling, the amount of chlorophyll in the leaf begins to decrease. Once the the levels of chlorophyll decrease, the hidden yellow, orange and red pigments are revealed and the leaves take on the beautiful and bright colors we love.
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