0:00 / 5:49
Why Do Leaves Change Color in Fall?
Discover the science of autumn leaves — how green chlorophyll hides other colors in summer, and how, in fall, the tree breaks it down so hidden yellow and orange (and new red) pigments appear.
How it works
- Press play to start the video.
- Videos 5 minutes or longer pause once or twice for a quick check. Get it right and you're on your way. If not, you'll see a friendly explanation and the video simply keeps going. Short videos skip the checks.
- At the end there's a 3-question test. Score 60% or more to complete the lesson, and 80% or more to master it. You can always watch again and try for a higher score.