The answer would be D. The only minerals harder than corundum is diamond.
Answer: scientific explanation
Explanation:
A really good scientific explanation should do two main things: It should explain all the observations and data we have. It should allow us to make testable predictions that we can check using future experiments.
Answer:
The first one is 425g of copper
Explanation:
The answer is C, because the moon does rotate it just rotates at the perfect time for us to never side the other side of it.
