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Weathering is the cause of mountains wearing away.
Erosion
It is a process called ridge push.
The process of wearing down or rubbing away fragments.
Erosion
Erosion
This process is known as erosion.
Weathering and erosion
Erosion, and oxidization
weathering
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 word "abraion" does not exist. You may have been thinking of "abrasion", which is either the process of wearing away or scraping, or damage to some surface because of wearing away or scraping.