In class today, we learned why leaves change color in the fall...
Plants need sunlight and warmth to make the green
chlorophyll in their leaves. If there is little or no sunlight,
new chlorophyll is
no longer made by the plant.
When summer is over and the weather
starts to cool off, this affects the trees in Washington and many other places
around the world.
In the fall, the days get shorter
and there is less sunlight, Without enough sunlight, the trees stop using photosynthesis to make
food. Then, the green chlorophyll dies away. As the green disappears, the beautiful colors of fall appear!
Guess what? The vibrant reds, oranges and yellows were hiding under the green chlorophyll the whole time!
So, why are our days shorter in fall and winter?
Here is a cool video which explains why the seasons change on earth.
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