Question: To discover how tough a certain mineral may be, one would
Choices:
text: measure the weight of it
label: A
text: smash it to see the inside
label: B
text: attempt to leave a mark on it
label: C
text: see if it is able to be crushed
label: D
Answer: C
Fact: if one mineral can scratch another mineral then that other mineral is softer than that one mineral