when he said his answer is " decaying organic matter forms into calcium carbonate which overtime compresses into limestone"
what does he mean by decaying organic matter? what is that specifically?
Decaying organic matter is things like dead organisms (plants and animals) which are being broken down and decaying. The nutrients from these organisms (such as calcium carbonate) will go back into the soil, and eventually, through the process of soil formation, compress into limestone.
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