Erosion
This process is known as erosion.
Erosion, and oxidization
weathering
Weathering and erosion
Yes, weathering can play a critical role in the building process of mountains. Weathering breaks down rocks into smaller particles which are then eroded and transported by natural processes like water and wind. These sediments can then accumulate and become compressed and cemented over time to form new rock layers, which can eventually be uplifted to form mountains.
The process of wearing down or rubbing away fragments.
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 breaking down and wearing away of rocks is called weathering. This process can be caused by physical (mechanical) or chemical processes.
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.
Ridge push is a geological concept where the force of gravity causes oceanic lithosphere to move downhill from a mid-ocean ridge, pushing tectonic plates away from the ridge. This process contributes to plate motion along with other forces like slab pull and mantle convection.
Erosion