Which type of levelling is done on the phenomenon, the difference in elevation between two points is proportional to the difference in atmospheric pressure at these points?

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51.	Which type of levelling is done on the phenomenon, the difference in elevation between two points is proportional to the difference in atmospheric pressure at these points?
A.	trigonometric levelling
B.	spirit levelling
C.	barometric levelling
D.	profile levelling
Answer» D. profile levelling

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