Explore the Appalachian Mountains: discover their location, ancient formation, and significant ecological impact on Eastern ...

Upon the demise of the Central Pangean Mountains 200 million years ago, height was lost, and valleys formed. A breakup occurred, which birthed both the Indian and Atlantic Oceans.

The most famous examples of this type of mountain are those that make up the Himalayas, which run over 1,500 miles (2,400 km) from end to end. These mountains were formed by the collision of the ...

He's referring to the Arkansas River Valley, which is home to Mount Magazine, Mount Nebo and Petit Jean Mountain -- three of the state's best-known mesas. Mesa is Spanish for table.

Thirteen peaks within the San Jacinto Mountains rise above the 10,000-foot level, including Jean Peak (10,570 feet), Miller Peak (10,400 feet) and Marion Mountain (10,362 feet).