As much as 4% of sand on Normandy’s beach is made up of miniscule fragments of steel, the remnants of shrapnel from WWII’s D-Day. It’s a story that’s part geologic wonder, and part reminder of what will be left of our civilization when we’re gone. More at BLDGBLOG.
4% of a beach is still a LOT of steel. To be fair to steel’s durability, the coast is a pretty rough place to hang out. All that sand came from shells and rock, which didn’t disintegrate by itself.