measuring the hardness of minerals requires doing what to them?
Trigonometry cartilage feedback Cladistics osculum damaging surface treatment
A B C D E F G H
Another type of damage is a scratch.
measuring the hardness of minerals requires damaging them
measuring the hardness of minerals requires doing what to them? (A) Trigonometry (B) cartilage (C) feedback (D) Cladistics (E) osculum (F) damaging (G) surface (H) treatment