Answer:
The only thing that can scratch Corundum is diamond.
Explanation:
We refer to the Mohs Hardness Scale for the hardness levels. We can see that Corundum is a level 9 which is the second highest so at a level 10 we see diamond, therefore diamond is the only thing that can scratch Corundum.
Groundwater is recharged naturally by rain and snow melt , hope this helps :)
The answer to your question is B, Lunacy.
That person would weigh 33.07 pounds on the moon