I live in Northern Ohio, a few huindred feet above sea level.
What are the layers beneath me??
How deep are these layers.
How far to the center of the earth?]
Where does it start to get molten?
I know we have Salt mines under lake Erie left over from old seas.
Well, for general information about the Earth’s crust and core, with tectonics and volcanism and all that neat stuff, you might want to start with an overview from The Encyclopædia Britannica - The lithosphere and the interior.
For specific stuff on Ohio, (although some of it is rather detailed instead on being an overview), the Ohio Department of Natural Resources has an Educational Resources page here:
http://www.dnr.state.oh.us/odnr/geo_survey/edu/edu.htm
From which the Geo Facts link (especially numbers 1 and 23) and the magazine Ohio Geology (with issues on-line) can be reached for further investigation. The leaflets (free) and guidebooks ($3 - $16 each) noted on the page can be ordered.