Geology, Palaeontology & Archaeology / Re: What are Rocks & Sand?« on: 31/05/2023 23:28:13 »
Any ordinary looking small rock on the side of the road, what is it made up of?A native rock (one not put there by the road construction process) is sometimes just the local stuff, which would be loose slate near me.
what's inside a single miniscule grain of sand?Sand is usually something from the watershed of nearby rivers. I grew up in Michigan where the entire lower part of the state is made up of sand and rocks, made of, well, Canada actually. None of it is 'native', but instead all pushed there from up north. Somewhere deep down is actual Michigan rock, but none of us has actually seen it.
Go to Florida and all the sand is made entirely of ground-up sea shells. In Hawaii the sand is black volcanic stuff. Local stuff in all cases.
Where I live now the beaches are all fake, so who knows where they found the stuff.