0:00 / 8:04
How Metamorphic Rocks Are Like Butterflies
Rocks can change from one kind into another! Learn how a rock like gneiss, with its wavy stripes, tells the story of once being a sedimentary rock before heat and pressure transformed it — a review of all three rock types.
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.