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.
The Appalachian Mountains run from Quebec to central Alabama, and they serve as the dividing line between rivers that flow into the Atlantic Ocean and those that flow into the Gulf of Mexico. The Rocky Mountains are found in the western United States and run through Colorado, Utah and Wyoming. The Andes Mountains are the largest chain of mountains in the world, and they run along the west coast of South America. Another well-known mountain range is the Alps, which are found in parts of Switzerland, France, Germany, Italy, Yugoslavia and Austria. The Himalayas are the tallest mountain range in the world. They are located across southern Asia and form a barrier between India and Tibet.