Define the angle of dip and the angle of declination.

(N/A) $1$. Angle of Dip (Magnetic Inclination): The angle of dip is the angle that the total magnetic field of the Earth makes with the surface of the Earth (horizontal direction) at a given location. It is $0^{\circ}$ at the magnetic equator and $90^{\circ}$ at the magnetic poles.
$2$. Angle of Declination: The angle of declination is the angle between the geographic meridian (true north-south line) and the magnetic meridian (the plane containing the magnetic axis of the Earth) at a specific point on the Earth's surface.