I just heard today that plants are made mostly of air, and a little water. Most of the structure of plants are carbon from CO2, and hydrogen from the rain. Just a very small amount is minerals from the soil.
Then if you bury those plants underground and wait a few million years, you can pump out those hydrocarbons and burn them so there is more CO2 for the plants again. (sarcasm)
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@freemo
That's exactly where I heard it!