Final answer:
Abrasion is the process when wind, water, or ice cause rocks to scrape away at other rock formations. It is a form of erosion and can be seen in the smoothing of riverbed rocks or the shaping of coastlines by waves.
Step-by-step explanation:
When wind, water, or ice cause rocks to scrape away at other rock formations, it is called abrasion. Abrasion occurs when particles carried by wind, water, or ice rub against rock surfaces, wearing them away over time. This process is a form of erosion, which is the gradual wearing away of the Earth's surface by natural forces. Examples of abrasion can be seen in the smoothing of rocks in riverbeds or the shaping of coastlines by waves.