Perhaps, then, you can easily explain (using numberic specifications and real data) why they are belts.

It seems to me that once to start trying to put numbers on how wide the "orbit cleared" zone must be, and on what % mass needs to be cleared, that you start to have problems fitting Earth in and excluding (for example) Ceres.

This kinda looks to me like the infamous pornography definition: "I'll know it when I see it."