question: What must be done to classify minerals?
choices.text: wash them Phylogeny bury them scratch them treatment Cladistics periodic table throw them
choices.label: A B C D E F G H
fact2: Minerals are classified by their hardness.
combinedfact: Classifying minerals requires scratching those materials.
formatted_question: What must be done to classify minerals? (A) wash them (B) Phylogeny (C) bury them (D) scratch them (E) treatment (F) Cladistics (G) periodic table (H) throw them