Multiple Choice
If the average geothermal gradient in an area is 15°C/km,how deep must oil shale be buried in order for it to transform into oil?
A) greater than 10 km but no more than 15 km
B) greater than 3 km but no more than 6 km
C) greater than 6 km but no more than 15 km
D) greater than 6 km but no more than 10 km
Correct Answer:

Verified
Correct Answer:
Verified
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