Erosion eventually turns mountains into hills and valleys.
Time and erosion turn young tall mountains into old, worn-down ones.
Most mountains are old.
the region that has old and rounded mountains is appalaichain mountains.
Wind and water erosion makes the mountains smooth.
The Ozark Mountains are hundreds of millions of years old.
the oldest mountains in the U.S.A
yes
Old Woman Mountains Wilderness was created in 1994.
appalachian mountains
the younger the mountains have not yet eroded.the mountains don't erode until they are old
yes
The basin & range