They inferred that the Appalachian Mountains have been eroding for millions of years.
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because they are very old and have been eroded by the elements
The Appalachian Highlands are old, eroded mountains (the oldest in North America) ranging from eastern Canada to western Alabama
The Appalachian Mtns are very, very old, highly eroded folded mountains.
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it has eroded the peaks
They both have been greatly eroded over time.
the peaks become weathered and eroded. that's why the peaks are rounded.
The Rocky Mountains are taller than Appalachian Mountains and has sharp pointy peaks. The Rocky Mountains are taller.They Both have eroded. The Appalachian Mountains are older and shorter than rocky mountains.
The Appalachian Mountains are mountains that are only about 30,000 ft in elevation, they are much older than the Rockey Mountains, so they have been weathered and eroded in witch gives them rounded tops and there shorter elevation.
The Rocky Mountains are taller than Appalachian Mountains and has sharp pointy peaks. The Rocky Mountains are taller.They Both have eroded. The Appalachian Mountains are older and shorter than rocky mountains.
At the link below see some pictures. Notice that the mountains are not very tall. That is because they are old and have been eroded.