Time, weather.
Over time, the Appalachian Mountains have been worn down by erosion from wind and rain. All mountain ranges do this.
Last I checked, the process was wind erosion. Water may have also played a role, but in a mountain range when it becomes more rounded, rather than jagged, it is usually wind erosion. the Appalachian Mountains are also hypothesized to be older than the Rockie Mountains therefore, having more time to wear away.
The Appalachian Mountains are older and more eroded than the Rocky Mountains.
because they have been worn down by approximately 250 million years of weathering and erosion. -Star
Last I checked, the process was wind erosion. Water may have also played a role, but in a mountain range when it becomes more rounded, rather than jagged, it is usually wind erosion. the Appalachian Mountains are also hypothesized to be older than the Rockie Mountains therefore, having more time to wear away.
by erosion
The Appalachians are older than the rocky mountains because of the fact that the Appalachians are smaller in size proving that the Appalachians have had longer to have been worn away by weathering also please do not just copy and paste you will learn nothing...
Young mountains have sharp edges because they have not been worn down by erosion. Old mountains are rounded and smoother.
Geologically speaking the Appalachians are older. The Rockies are an example of geological upheaval, while the Appalachians used to be a solid plain millions of years ago and eroded to become the mountains we have today.
The Appalachian and the Smokey Mtns. The are relatively old and weather worn mountains (smooth) as compared to 'young' mountains like the Rockies or the Alps, which are jagged with rugged, sharp peaks.
They're worn down from mountains and volcanoes.
The Appalachian Mountains have a northeast-southwest orientation and runs for about 400 miles (640 km) from north-central Pennsylvania, through western Maryland and eastern West Virginia, to southwestern Virginia.