Your class goes on a field trip to observe drilling machinery. The geologists at the drill site show you displays of drilled rocks to compare different types of drills and methods. The drilled holes in one rock display are significantly larger than the holes drilled in the display next to it. Given this information, which statement is correct?

The rock display with smaller holes shows copper drilling, which is deep underground.
The rock display with smaller holes shows copper drilling, which is deep underground.

The rock display with smaller holes shows petroleum drilling, which is closer to the surface.
The rock display with smaller holes shows petroleum drilling, which is closer to the surface.

The rock display with larger holes shows petroleum drilling, which is deep underground.
The rock display with larger holes shows petroleum drilling, which is deep underground.

The rock display with larger holes shows copper drilling, which is closer to the surface.

3 answers

Based on the information provided, larger holes in drilled rocks are generally associated with petroleum drilling, as this method often involves larger diameter drills to access oil reservoirs. Smaller holes are typically associated with copper drilling, which often occurs through narrower or deeper drilling methods.

Given those tendencies, the most reasonable conclusion would be:

"The rock display with larger holes shows petroleum drilling, which is deeper underground."

It's important to understand that drilling for petroleum can occur at various depths, but the larger holes are typically indicative of methods used to drill for petroleum resources. On the other hand, copper drilling is often more precise and may require smaller holes. If we had to choose one from your options based on common drilling knowledge, we'd go with the first part of that reasoning. However, the specifics of the depth can vary depending on many factors like location and geology.

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