Mohs hardness scale. hope this helps
Explanation:
Below is an attachment containing the solution.
Answer:
I THINK it’s A
Explanation:
Because all the other answers don’t make sense.
<span>Suppose you mixed two chemicals in the lab until you could not tell the two apart. After some time passed, a white powder formed which would not dissolve, and settled on the bottom. The mixture was first homogeneous then heterogeneous. </span>