Answer:
A and D I think
Explanation:
It's not erosion, so that is out of the answer choices. And I doubt it is crystallization, so that is why I think it is A and D. (correct me if I am wrong.)
Solar eclipse
Ignore this need to get 20 characters
Yes it will affect the ph level
I'd use the library, the encyclopedia and the Internet.
C Dermis because it’s not the others ones