See geomagnetism.
1. The angle of inclination of a planar feature measured from a horizontal datum. The true dip is always measured in a vertical plane perpendicular to the strike of the plane of either bedding or cleavage. The angle of dip measured in any plane not perpendicular to the strike is an apparent dip and will always be less than the true dip.
2. (magnetic) The inclination of the Earth’s magnetic field from the horizontal. Positive dips are downwards, negative are upwards from the horizontal plane.
Dip
The angle of inclination of a rock down its steepest slope, that is to say, the direction at right angles to the strike. Dip is the angle between the maximum slope and the horizontal. A dip slope occurs where the slope of land mirrors the slope of the underlying strata.
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