Ring vs. Rang vs. Rung. You can tell when to use ring, rang, or rung by whether you need the present, past, or past participle (used with has or have) form. I always ring the bell after I knock. He rings twice before entering.
The rocky mountains passes through six states. The six US states  are: New Mexico, Utah, Colorado, Idaho, Montana, and Wyoming.
If you drive west from Boulder up the slope to Rocky Mountain National Park, you will go through sedimentary rocks, made from sediments brought down from the current Rockies and from earlier versions of the Rockies.