Yards also get dust deposited from the breeze, and the bodies of burrowing ants, insects, small mammals, any leaves or grass missed by the rake, cat or raccoon poop, and any thing else.
Intensive farming can cause soil in a field to shrink, maybe partly because it blows away or is washed away by rain due to being broken up, but since the turf in the lawn is usually not too disturbed, there’s less of that.
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