Weeds come up through pavement, catching dirt and plant debris, other plants send out roots and grow in the soil over the paving. It doesn’t take that many years for the walk to disappear under vegetation and soil. More in places with falling leaves or floods or forests. Multiply that by hundreds or thousands of years, and it all gets very deep.
I didn’t really understand this until I had a house and garden to tend, just how fast it all builds up. Digging up to prepare beds I found a horseshoe, a toy Storm Trooper, marbles, broken china and beads, and a half dozen spoons.
Things lay on the ground or crumble. Over time they sink or are buried by the natural build up of sediment.
Think of something you own or have dropped, especially something metal, sturdy, and heavy. A few years later you find it half buried. Or maybe you find it with a metal detector and say “I was wondering what happened to this lock!” Or “I knew i left this shovel out”
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