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THE CHEMISTRY OF AUTUMN COLORS Every autumn across the Northern Hemisphere, diminishing daylight hours and falling temperatures induce trees to prepare for winter. In these preparations, they shed billions of tons of leaves. In certain regions, such as our own, the shedding of leaves is preceded by a spectacular color show. Formerly green leaves turn to brilliant shades of yellow, orange, and ...
scifun.chem.wisc.edu/chemweek/fallcolr/fallcolr.html
State University of New York College of Environmental Science & Forestry ...
www.esf.edu/pubprog/brochure/leaves/leaves.htm
Why do leaves change color in Fall Learn why leaves change color and fall off the treees in autumn. Plus, get great science projects to do.
photoscience.la.asu.edu/photosyn/education/colorchange.html
CHANGING COLOR Every year at this time we revel in the beauty of the trees, knowing well that it is only a fleeting pleasure. Before long the leaves will flutter away from their summer home and become a part of the rich carpet that covers the forest floor. Many people suppose that Jack Frost is responsible for the color change, but we now know that change in coloring is the result of chemical ...
www.ces.ncsu.edu/nreos/forest/topics/leafco~1.html
Autumn weather conditions favoring the most brilliant colors are warm sunny days and cool, but not freezing, nights.
www.stormfax.com/leaves.htm
