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 ...

The physical signs of fall begin when the leaves change color and start to fall from the ... plants convert light energy from the sun into chemical energy, producing oxygen in the process.

DAVENPORT, Iowa (KWQC) - Yellow, orange, red, brown, and green are just a few of the colors of autumn ... involves a specific ...