The Correlation. Correlation is a measue of how close the line fits the points that you found in your experiment. Anyone can say whether they think the line is a good fit or not, but to measure it exactly, we use the correlation coefficient: R2.
As the seasons change and the amount of sunlight decreases, less chlorophyll is produced, and the leaves appear less green. Chlorophyll is broken down into simpler compounds at a constant rate, so green leaf color will gradually fade as chlorophyll production slows or stops.
Why do leaves change color in the fall season? In some areas of the world, the weather changes in the fall, making the air turn cold. During this time, many leaves also change colors. Why does this happen? First let's think about why some trees drop their leaves before winter.