Abrasion (geology)
![Glacially abraded rocks in western Norway near Jostedalsbreen glacier.](/Images/godic/202412/13/Glacial-abrasion-ss-20060829.jpg")
![Polish coast of the Baltic Sea](/Images/godic/202412/13/Sar80e0829.jpg")
Abrasion is the mechanical scraping of a rock surface by friction between rocks and moving particles during their transport by wind, glacier, waves, gravity, running water or erosion. After friction, the moving particles dislodge loose and weak debris from the side of the rock.