WHAT CAUSED THE DRILLING OF THE BOREHOLE TO STOP
3. What caused the drilling of the borehole to stop?
A. reaching the limit of the crust.
B. the slow progression of the work.
C. an ability to cope with heat.
3. What caused the drilling of the borehole to stop?
A. reaching the limit of the crust.
B. the slow progression of the work.
C. an ability to cope with heat.