* Rock Definition: A rock is a naturally occurring solid aggregate of one or more minerals. It has a specific composition and structure.
* Dust Formation: When rocks are rubbed together, they break down into smaller particles. These particles are no longer a cohesive whole with a defined structure like a rock.
* Size and Composition: Dust is extremely fine, with particles that are too small to be considered individual minerals or rock fragments. It often contains a mix of different minerals and organic materials.
Think of it like this: Imagine breaking a large rock into smaller pieces. Eventually, you'll have gravel, then sand, and finally, dust. The dust is just a very fine powder, not a rock anymore.
