I understand what water and air are composed of and I more or less understand how fire works. But what is soil? If you put your hands in your garden, you will take out very heterogenous stuff, you will get some twigs and bugs which of course are organic matter, but what’s the general brown stuff? Is it organic? Were does it come from and how is it produced? Also collateral question, if earth is organic matter, when the first living organisms came out of the ocean, which were plants, how did they find nutrients?
In: Planetary Science
To your second question, before there were microbes on land, the plants from the water, which only needed sunlight and CO2, started to grow on land. then they died, decomposed and microbes started eating the dead plants.
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