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 think it could be mountains.. if I'm wrong then I'm sorry..
A light year (186,00 miles). (300,000 kilometers per second)
An economy based on trade
Quickly it is the biggest, least populated, and it has a giant supply of natural resources just develop on those points.