Discussion
The vertical angle between longitudinal axis of a freely suspended magnetic needle and a horizontal line at its pivot, is known as:
Answer: C
The angle is called the dip.
A freely suspended magnetic needle aligns with the Earth's magnetic field, which is inclined to the horizontal everywhere except at the magnetic equator. The vertical angle between the needle and the horizontal is the dip or inclination; it is zero at the magnetic equator and 90° at the magnetic poles. Compass needles carry a small rider to counteract it.
Declination is the horizontal angle between the magnetic and true meridians. Azimuth and bearing are horizontal directions of a line, not vertical angles.
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