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                                    What is levelling how is it done. | 
                            
                                   
Answer» LEVELLING is a process of DETERMINING the height of ONE level relative to another. It is used in SURVEYING to establish the ELEVATION of a point relative to a datum, or to establish a point at a given elevation relative to a datumHOPE IT HELPS YOU ✌✨✌✨  | 
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