Abrasion (geology)

When rocks bump into each other or other things like wind, waves, or ice, they can rub against each other and break little pieces off. This is called abrasion. It's like when you rub your hands together really fast for a long time and they start to feel warm and maybe even hurt a little bit. The same thing happens to rocks over time. These little pieces that break off can become sand or even become part of a bigger rock somewhere else. So, abrasion is just a way that rocks can change over time as they rub against other things.