Question: Hardness of minerals may be measured in certain ways, such as what?
Choices:
text: heating the minerals to high temperatures
label: A
text: applying pressure using a sharp, tough object in order to leave marks
label: B
text: hitting the minerals with a tougher stone
label: C
text: taking bits of metal and comparing the texture to the minerals
label: D
Answer: B
Fact: measuring the hardness of minerals requires scratching those materials