Question: A micro-scratch test is able to determine which rock formations deep inside the earth's sub-surface are the hardest and how resistant the formations are to being
Choices:
text: scratched, fractured or otherwise deformed
label: A
text: transformed into different minerals
label: B
text: melted and otherwise liquified
label: C
text: scratched with ice breakers
label: D
Answer: A
Fact: heat and pressure change the remains of prehistoric living things into natural gas