In an article about the pending trade war between the USA and everybody else, the writer mentioned the sixty million tonnes of wheat that the fields of Kansas produce.
I looked up the density of wheat seeds: It’s 0.79
So that tonnage of wheat would occupy 76 million cubic metres. (60m/0.79)
Let’s spread that out two metres deep. Two metres makes sense to me; it’s just fifteen centimetres (six inches) over my head.
Now we’ve got an area of 38 million square metres, two metres deep. That’s 6,000 metres square.
That’s six kilometres.
All that wheat would occupy a space two metres deep in a square six kilometres down each side.
Or in yards and miles, that’s two-and-a-bit yards deep and nearly four miles square.
A lot of wheat.