Because before it's a wafer, it's a big sausage of monocrystalline silicon: https://en.wikipedia.org/wiki/Czochralski_method https://en.wikipedia.org/wiki/Czoch

Because before it's a wafer, it's a big sausage of monocrystalline silicon: https://en.wikipedia.org/wiki/Czochralski_method https://en.wikipedia.org/wiki/Czochralski_method