Faith writes:
May God help me to leave this place now.
There's a park close to my house with a boulder that I like to sit on and watch the ducks. It's about a cubic yard, a couple of tons, I guess, and eroded smooth and round.
You can see the layers in it as plain as day. They're about a millimeter thick. They're different colours. There are definite grooves where they have eroded at different rates.
I recommend that you go outside and look at a rock.