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Where Can We Find Water?
Where does water come from? Explore groundwater from rain and snow, mighty rivers like the Congo, huge freshwater lakes, and the salty oceans that hold almost all of Earth's water.
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.