Question

Two unknown mineral samples, A and B, are rubbed against each other. Mineral A scratches mineral B. What can you infer about the minerals? (1 point)  

Answers (Multiple Choice):

Mineral A is harder than mineral B.
Mineral B is harder than mineral A.
Mineral A is more dense than mineral B.
Mineral B is more dense than mineral A.

Answer 1

Mineral A is harder than mineral B.