It might even happen faster than that. If I don't sweep my cement patio for abou... | Hacker News

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		asdff 6 months ago \| parent \| context \| favorite \| on: Four strange places to see London's Roman Wall It might even happen faster than that. If I don't sweep my cement patio for about a month, the decaying leaves from the bushes are enough to make about an 1/8th inch of fresh brown soil under the leaf piles.

pmontra 6 months ago [–]

Exactly. This is hard to understand when living in a flat in a modern city but it's immediately clear in any other case.

My figure of 1 mm is about the compacted result of decaying and layering. It may vary a lot according to the configuration of the ground.

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