Why do leaves change color in Fall?

Learn why leaves change color and fall off the trees in autumn:
Autumn leaves

Take your own photos of autumn leaves and put them in the table below
and add location and date.
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Poland, Jastrzębie Zdrój, 2009.10.31
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Poland, Jastrzębie Zdrój, 2009.10.31
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Poland, Jastrzębie Zdrój, 2009.10.31
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Poland, Jastrzębie Zdrój, 2009.10.31
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Sweden, Kalmar 2009.10.04
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Sweden, Kalmar 2009.10.04
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Sweden, Kalmar 2009.10.04
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Sweden, Kalmar 2009.10.04
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Poland, Jastrzębie Zdrój, 2008.10.15
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Sweden, Kalmar, 2009.10.07
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Czech Republic, Dub nad Moravou region, 2009.10.15
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Czech Republic, Dub nad Moravou region, 2009.10.15
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Sweden, Kalmar, 2009.10.14
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Sweden, Torsås, 2009.10.05
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Czech Republic, Dub nad Moravou region, 2009.10.13
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Czech Republic, Beskydy mountains, late August 2009
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Sweden, Kalmar, 2009.10.14
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Sweden, Kalmar, 2009.10.14
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Hungary, Kiskunhalas, 2009.10.14
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Hungary, Kiskunhalas, 2009.10.14.
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Poland, Jastrzębie Zdrój, 2009.10.31
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Poland, Jastrzębie Zdrój, 2009.10.31