Surveying
The prime vertical passes through

The zenith point of the observer
The east point of the horizon
All of these
The west point of the horizon

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Surveying
The difference between a level line and a horizontal line is that

level line is a curved line while hori-zontal line is a straight line
both are same
horizontal line is normal to plumb line while level line may not be normal to the plumb line
level line is normal to plumb line while horizontal line may not be normal to plumb line at the tangent point to level line

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