What are trees made of?
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If someone asked you where the mass of a tree comes from, what would you say? Have you ever really thought about it as you climbed through tree branches or walked through a forest? Is it the soil the plant is rooted in, the atmosphere above it, what do you think? Watch this lesson and find out more!
What is meant by a closed system?
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TED-Ed Best of Web are exceptional, user-created lessons that are carefully selected by volunteer teachers and TED-Ed staff.
Meet The Creators
- Video created by Veritasium
- Lesson Plan created by Kim Preshoff