> Sand is not a different physical form than that which causes cancer. This is incorrect. Sand is larger, rounded, particles. Toxic silicosis is caused by smal

> Sand is not a different physical form than that which causes cancer. This is incorrect. Sand is larger, rounded, particles. Toxic silicosis is caused by small (like 10um) particles. The physical form is what makes it possible to inhale one and walk on the other. The chemical form is identical.