Surveying
If the magnetic bearing of the sun at a place at noon in southern hemisphere is 167°, the magnetic declination at that place is

13° W
77° N
23° S
13° E

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Surveying
Contour interval is

Directly proportional to the flatness of ground
Larger for accurate works
Larger if the time available is more
Inversely proportional to the scale of the map

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