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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!

Johann Baptista van Helmholt used the soil he placed in the pot when he was growing his tree as the control in his experiment. The amount of soil in the pot always:

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