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Every autumn we revel in the beauty of the fall colors. The mixture of red, purple, orange and yellow is the result of chemical processes that take place in the tree as the seasons change from summer to winter. During the spring and summer ...
http://www.esf.edu/pubprog/brochure/leaves/leaves.htm
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Many people suppose that Jack Frost is responsible for the color change, but we now know that change in coloring is ... Fall weather conditions favoring formation of brilliant red autumn color are warm sunny days followed by cool, nights with temperatures below 45o F. Much sugar is made in the leaves during the daytime,
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www.ces.ncsu.edu/nreos/forest/topics/leafco~1.html
www.ces.ncsu.edu/nreos/forest/topics/leafco~1.html
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Three factors influence autumn leaf color-leaf pigments, length of night, and weather, but not quite in the way we think. The timing of color change and leaf fall are primarily regulated by the calendar, that is, the increasing length of night. ... Why Leaves Change Colors...
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www.na.fs.fed.us/spfo/pubs/misc/leaves/leaves.htm
www.na.fs.fed.us/spfo/pubs/misc/leaves/leaves.htm
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Streams and lakes add special enchantment in the fall for fishermen and boaters, ... Individual leaves, even of the same species, turn color in many different ways. These maple leaves show both a complete change across an entire leaf (top), and partial change (bottom), with blocks of tissues turned brilliant red while...
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www.na.fs.fed.us/spfo/pubs/misc/autumn/autumn_colors.ht...
www.na.fs.fed.us/spfo/pubs/misc/autumn/autumn_colors.htm
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Why Do Leaves Change Color? ... Why do leaves fall? ... Do leaves change color because of weather?
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www.dnr.state.wi.us/org/caer/ce/eek/veg/trees/treestrue...
www.dnr.state.wi.us/org/caer/ce/eek/veg/trees/treestruecolor.htm
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Why Leaves Change Color in Fall ... Why do leaves turn color in autumn? That's a very exciting question -- with an equally exciting answer! ... Inside a leaf there are millions of little packages of color in green, yellow and orange.
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www.kidzone.ws/plants/autumn1.htm
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Why More Autumn Leaves Are Red In America And Yellow In Europe: New Theory (Aug. 17, 2009) — Walking outdoors in the fall, the splendidly colorful leaves adorning the trees are a delight to the eye. ... 21, 2008) — Under UV light, ripening bananas appear in a bright blue color, ... Dozen Chemicals Strongly Impact Climate Change...
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www.sciencedaily.com/releases/2007/10/071012104737.htm
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The three main pigments that color leaves are chlorophyll, ... The yellow, gold and orange colors created by carotenoid are always present in leaves, and the amount does not change in response to weather. A severe frost will kill the leaves, turning them brown and causing them to drop early.
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www.greatriverroad.com/Fall/fallChanges.htm
www.greatriverroad.com/Fall/fallChanges.htm
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This PlantTalk Colorado script discusses why leaves change color in the fall. ... 1728 ; Why leaves change color in the fall ... What causes leaf color to change from green to yellow or red in the fall?
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www.ext.colostate.edu/ptlk/1728.html
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