Your class goes on a field trip to observe drilling machinery. The geologist at the drill site show you display of drilled rocks to compare different types of drilled and method. The drilled holes in one rock display are significantly larger then the holes drilled in the display next to it. Given this information which statement is correct?
A. The rock display with smaller holes shows petroleum drilling which is closer to the surface
B. The rock display with larger holes shows copper drilling which is closer to surface
C. The rock display with larger holes shows petroleum drilling which is deep underground
D. The rock display with smaller holes shows copper drilling which is deep underground