Answer:
Option C. Is used to cool the drill bit and to flush rock cuttings up and out of the drill hole
Explanation:
Drill mud plays a vital role in the drilling process. Its addition into the well-bore does a lot in enhancing the drilling processes and activities.
Among other importance and function of the drill mud /fluid:
1. It is used to cool off the drill bit
2. It flushes rock cuttings out of the drill hole
3. High pressure control
4. Providing buoyancy
5. Lubrication
I believe the correct answer to your question is option C. It is a process by which greenhouse gases allow the sun’s light to penetrate the atmosphere but stop the heat from escaping.
The greenhouse effect is the natural heating of the Earth's surface.
Hope I could help! :)
